I looked it up and found the solution months ago. However, the system does store many past performance scores per player, instead of just a rating and standard error. Contest skills which you may wish to develop include: algorithmic fundamentals, mathematical problem solving, and speed and precision of implementation. Some random blog on CF: So you are an expert, You have algorithmic expertise exceeding that of a typical professional. To me, the word "Apprentice" suggests something between a student (aka Pupil) and a professional (aka Specialist). You are right. In my opinion, it's an extremely unefficient solution because benefit of cheating in average is much greater than 10 pts. Comming soon. Hello, is it possible to show a virtual rating change for the virtual contests; furthermore, after finishing the contest it shows how the participant's rating could have changed if s/he participated in the contest without changing the actual rating? UPD I've found the reason of issue. Why was my code rejected on CodeChef having similar approach and implementation to the correct one? Thanks! I like the descriptions but I wouldn't take them too seriously in relation to IOI/ACM. It's awesome, I use it daily, thanks for doing this, The only programming contests Web 2.0 platform, Educational Codeforces Round 144 Editorial, Teams Going to the 2023 ICPC North America Championship, How to sum up all natural numbers (and their non-negative powers). Virtual participation is a great way to compete without worrying . Add alert messages for invalid handle inputs. Contest rating systems can trace their heritage back to the Elo system. I'd like to thank Rubanenko and all other members of NBHEXT developers team for your shared sources and MikeMirzayanov for the great Codeforces platforms with shared API & ratings formulas. A team of IGMs would be slated among the favorites to win ICPC outright. Reply. As far as I know new chromium based microsoft edge supports chrome extensions. Educational Round 144 Problem C another version? Good job, CodeForces team. Issues. Using optimized parallel algorithms, it took about half an hour to simulate the entire history of Codeforces on a modest laptop; it can be made even faster if subsampling-based approximations are used. Hmm perhaps, but you get more help in interviews, right? But instead, it got decreased. This was prediction before system tests. Thanks to the retroactivity it is usually easy to differentiate quick learners from people who've had previous experience. CF predictor is calculating delta using that rating. Yes, for some users, it takes 1500 rating as previous rating. Also, they can register right before the contest if they decide to participate. A huge number of your nerve cells die every time when you wait for a rating update on Codeforces. umm.. can you please tell me how you calculate change in rating after a contest on the basis of his standing? Codeforces Visualizer | Virtual Rating Change Calculator. 2, Rated, Prizes! Codeforces. why there is no overall rank based on ratings. Problemset; Groups; Rating; Edu; API; Calendar; Help; Rating changes for last rounds are temporarily rolled back. What do they mean? But try both methods. Comming soon. It's much more common to work on LeetCode or Hackerrank, where the problems are more standard, like something from a textbook rather than a contest. Tested on Firefox 60. Thanks. A new rating system was created for new users recently. He will get near +77? Considering all the submissions are stored in the database, would you please add page up/down function for status page of each problem so everyone could view every successful submission of a specific problem? But official cf rating works somehow different, and I don't know where my mistake((. I don't understand. From now you could use this service, it calculates approximate rating changes for every contestant. A contestant's rating increases should they perform better than their seed, and decreases should they perform worse. 1 0. Educational Round 144 Problem C another version? Not cruel, approx. Maybe I did not understand bug correctly, but wasn't the rating change caused by tourist beating himself? Your achievements are of historic importance to the community, pushing the limits of what's thought to be possible. Is that fine ? Add web app to Firebase. Waiting for others :). However, I found them helpful. For example, you can practice standard interview dynamic programming questions (Kadane's algorithm, Longest Common/Increasing Subsequence and variations, etc.) Methods. Check it out:), Maybe I miss something but why use this, when there is NBHEXT? 2, Rated, Prizes! Thank you for reporting, I'll look on this. For example next (432nd) place (purple participant) increased his rating 1714 -> 1727. don't participate if you've already seen the tasks; don't participate if you only want to commit one problem or if you don't want/can't participate in the whole contest; during the contest don't read tutorials, don't use somebody else's code, don't talk to other people; try to make it an efficient and enjoyable training. I had the same problem, and I could not create a virtual contest for the variety of teams Perhaps, I misunderstood the specifications but in the individual, it worked perfectly. Does the average rating stays around a exact number? Codeforces Round #854 by cybercats (Div. For someone who participates regularly on both the platforms. After evaluation was done, I got to know that my code was accepted and I got 366 as my score for the problem. ), All resources to learn competitive programming, Educational Codeforces Round 144 [Rated for Div. You know, browser extensions work that way that you can enable and disable them whenever you want. Codeforces. How is every users's seed (expected rank) calculated? Another Codeforces Solve Tracker. In light of oncoming ACM-ICPC subregional and regional contests it can be regarded as yet another opportunity to train. It would be a good idea if you could invite others (which have Codeforces accounts, of course) to participate in your virtual contests. 2. You only get the probability of him beating himself, no matter what places the others take. Why? And the actual problem is that I can't update code ASAP. The rating de. 2 combined round, select Div. This is to be expected seeing that purely algorithmic tasks on here wouldn't be much more than a test of your templates. It follows that the predictor needs ratings to operate, which, among other cf features were not present during the contest. Also i would like to point out that codechef ratings are inflated. When it comes to algorithmic software engineering interviews, you'll be a strong candidate, even at some of the most prestigious technology companies. . . That contest that you took part in was made unrated, check the round announcement. I think it would also be great if just pretests would be used in virtual contests where it is possible or at least to have a choice, as long as I want to know how I would suceed in real round. In Codeforces Round #635 , I finally became Candidate master . Math Enter Virtual participation - 03:00 Final standings. In my opinion, it's never too early to join! Codeforces: Problem Difficulties. Thanks man! I just participated in virtual contest and it was awesome. Typically problems A and B in a div2 do not require DSA but just pattern observation, two people with 1700 and 2200 leetcode rating could be equally good at them, or sometimes the 2200 might struggle while the 1700 solves it easily. So, it's not rated for you. What happen to me ;-; It doesnt show anymore ;-; i suppose all profiles are temporary blocked and cfpr needs ratings to work? This would destroy the whole rating idea. It shows approximate deltas during and after the contest. Rating system using virtual contest result(s). Features. Elo-R takes advantage of some properties of programming contests to try to get the best of both. The numbers refer to subsets of the 99832 players who've competed on Codeforces in the past 6 months, as of May 30, 2021, rated according to the Elo-MMR system which I use with the UBC team. :(. Teams of up to 4 students will spend 3 hours solving interesting algorithmic problems. It partly modifies the contest standings page and shows approximate rating changes for every contestant. So far there's only one contest available for alpha-testing: it's Codeforces Beta Round #76 (Div. You can install tampermonkey here -> https://tampermonkey.net/, And then install CF-Predictor here -> https://greasyfork.org/zh-CN/scripts/38050-cf-predictor. The delta calculation is done in real time. Usage. It was not working for me too. As some of you have already noticed, we are introducing the innovation &mdash a virtual contest system. Especially the highest rating ever reached?? Sorry but can it predict at the moment we chose ? Before updating your rating after the end of the round, for each participant his seed is calculated, that is the place that the participant is expected to take in this competition. Also, when you are new to a site like this, how does he even find the newer blog. U can add it by clicking on chrome extension of it. Your handle is familiar to the entire competitive programming community. We'll add something, too, to give the system final flourish, but in any way we're waiting for your commentaries rich in interesting ideas and suggestions. In src/firebase folder, create index.ts and write it like below. I have not updated my CF username since joining the site. Please fix. Compute role send requests to codeforces, compute approximate rating changes and store some of them in the cache. It can grab problems from other regular online judges and simulate submissions to other online judges. Servers run only in the contest's days to prevent overusing free tier resources. If top1 has rating 3000, and all other contestants have rating 1000, then his (top1) expected place is very close to 1.0. Points Not valid points. Virtual Participation: This is like a virtual contest, in case you missed any contest or want to participate again. Each person is characterized by their rating, the number R. If person A 's rating is RA, and person B 's is equal to RB, then the formula. It's an open hosted visualizer for codeforces accounts that tells you complete details of a user on codeforces, such as: his rating change, no. Thats an amazing extensionAlmost accurate it showed +20 and I got +21You did an amazing job. 2, Rated, Prizes! I hope, it doesn't take lot of time:). 4) contest held yesterday, the tool showed an expected +17 points rating-change by the end of the system test. Thanks. Is there any alternative? Codeforces. I'll have to properly explain Elo-R at a later date, but one modification is that displayed ratings are actually mu - 2*(sigma - sig_limit), where sigma starts at 350 and eventually approaches sig_limit = 80. Some of the issues noted in the paper have negligible impact on programming contests: for example, we don't have isolated cliques of competitors that only play against each other. I have the same problem with chrome. In that case, your journey has only just begun Also gained motivation for doing better than our previous best. WasylF, It's still not working on my chrome for HTTPS version :(, skmonir, could you please check version of extension? After setup, copy your firebase config. What would be a plausible reason for this large inaccuracy in predicting the rate change? Colloquially, your color is a variant of red called "nutella": analogous to the "targets" of TopCoder, the white bull's-eye is substituted by a black first letter in the style of the Nutella logo. It seems the variance of the tool is quite high. ), All resources to learn competitive programming, Educational Codeforces Round 144 [Rated for Div. it takes about two hours after the contest to get the rating change. However, today I updated my Firefox web browser and it's not working anymore. Hey, the rating predictor isn't predicting correct delta. Is it fair? Is it just me or does anyone else feel that it would be more suitable to give the top three ranks a different color? I used safari-web-extension-converter to let it and competitive companion run on Safari(>14.0),It is now available on the AppStore,but unfortunately,According to CORS I cannot send the request to CF-Predictor ,so you need to disable Cross-Origin Restrictions before use. of questions attempted by user, topics wise distribution of user's practice, etc. Free heroku account gives you a limited amount of free hours per month, so I need to spend them wisely :), Have you considered Azure Web Services? Or in other words, is $$$\Sigma\Delta$$$ in each round around 0? I suppose, most of them do not have an evil plan like described above but they just find problems complicated and decide do not risk that is unfair too. The main goal of writing this blogpost . Just look on the list of registered users before the contest and sort them by rating in descending order. You might start with sites such as LeetCode which are more oriented toward basic knowledge and professional development, rather than competition and problem solving. You don't get main idea of Elo-based ratings. (predicted -48, real -4) Possible reason: the binary search algorithm ( getRatingToRank function) in the official code initialize the left variable to 1, so the result is incorrect for values < 1. You're right, I talked before I actually tried it :D. The places where LOCKS locate in are ideal for showing success rate when a contest is over. ), All resources to learn competitive programming, Educational Codeforces Round 144 [Rated for Div. Also there is a difference of around 250-300 in the ratings between codechef and codeforces. Isn't there a button like in other web browsers? Weekly Contest 333. The obsession to optimize one's rating can be counter-productive and cause hurt feelings. I recently started working in Google and they have pretty strict policy about open source projects. Hello codeforces community, I want to present to you all my codeforces Virtual Contest Selector to find and participate in virtual contests with friends without any hassle. UPDATE (May 2020): it's written now, I added the link! One interesting finding is that the 1800-1999 Elo-MMR range (Candidate Master) corresponds to a wider Codeforces range than the levels either immediately above or below. Probably there is a bug that comes to light only when we are dealing with very high rated users. It seems that the system has been updated, and now the sum of ratings decreases after contests. Someone rated 1400 on codeforces will be around 1700-1800 on codechef. He probably just googled some keywords, stumbled on this blog, and commented. Though, there was a '-1' for Problem-B. It doesnt work in virtual participant. It predicts to you -65, 2 point lower than actual results. I'm new in codeforces. I've deployed an update today. As at TopCoder all users are divided into two divisions: the first (rating over 1650) and the second (rating_ not more than 1650). chat Discord Join the community's discord server and meet awesome people. Therefore for two participants the probability to win/lose depends on subtraction of their ratings. But does Codeforces discourage it? Which sums up to 1400 or 1500. I suggest to relax a bit. Competitive programming is a mind sport usually held over the Internet or a local network, involving participants trying to program according to provided specifications. Every cached value recomputes once a few minutes. As I mentioned on previous contest I'm working on tool that predicts rating changes. Still, the graph can smoothly model periods of skill change as well as stagnant phases. Felt like, as if they were like zodiac signs being described. You should just open standings page of active or recently ended contest. At this stage, you might be new to programming. Is it possible to update the tool so as to make it more accurate? Finally, keep track of your motivations, whatever it is that you hope to get out of the experience: be it to prepare for whiteboard interviews, to be exposed to ideas for computer science research, to play a competitive mental sport, to meet other problem solvers, or just to keep your mind active with fresh puzzles. 2, Rated, Prizes! So, someone who has some knowledge of DP, and someone who has no knowledge both can't solve that DP question, and their ratings will in general be similar. Could you please provide more data with final standings of a contest? there is aproblemin time , it depend on server time or client time ?? How is it possible that this post isn't +1000? While I haven't yet tested whether that's the case, it's suggestive that Divisions 1 and 2 might be better-separated in my system: that is, an in-between player's rating updates aren't unduly advantaged when competing in the weaker division. By this probabilities we can count your approximate place(seed), then get your real place(rank) and find change of rate, based on them. Elo rating's idea is to make expected rating change equal to 0 for every properly rated individual. http://codeforces.com/problemset/status/112/B, http://codeforces.com/contest/##/status/A, Educational Codeforces Round 144 Editorial, Teams Going to the 2023 ICPC North America Championship, How to sum up all natural numbers (and their non-negative powers). I receive this message when I try to participate in Saratov Contest. Codeforces Round #854 by cybercats (Div. I installed an extension that helps to download Chrome's extensions, here is the link https://addons.opera.com/en/extensions/details/install-chrome-extensions/. But if top1 has rating 3000, and all other have rating 2999, then I am not so sure that top1 will win this contest:) And his expected place is actually close to n/2:), You proposed easy approach to calculate expected position in standings, but it is not right Elo-based way. Similar to this issue, deltas today were calculated using ratings from 2 contests ago. The first line of each test case contains two integers n and q ( 2 n 10 5, 1 q 10 5) the number of tournament participants and the number of questions. If your motivation was professional development or job interview preparation, this range might be your ultimate goal. I just thought some concepts might still be interesting, if not for ranking users directly but simply for making nice comparisons. If you worry too much about losing points on a bad day, you might decide to skip contests on any day in which your mental preparation is less than perfectly optimal. Educational Round 144 Problem C another version? It is on validation now. but what can just a little upvote do against 61 downvotes ? Codeforces Round #854 by cybercats (Div. In my Pacific Northwest region, we prepare Division 2 contests (roughly equivalent to Division 3 on Codeforces) to provide a fun and educational experience for novices. agree , i think a good alternative is TC system , the timer start counting when you open the problem and if you opened any problem your rating will be changed . Today i solved one problem in a contest. He took place much higher, so his rating should increase. Rating formulas aren't public in CF. I am sending you a PR, please review it and if possible update the Extension as soon as possible. If you participate as a team, please make sure that the registered team represents all your team members and nobody else. A '-74' in my rating. "if the participant A had worse rating than the participant B before the contest and finished the contest on the worse place then after recalculations the the rating of A cant be greater than the rating of B". Seen here: https://cf-predictor-frontend.herokuapp.com/roundResults.jsp?contestName=Codeforces+Round+%23618+%28Div.+1%29&contestId=1299&sbm=Get+rating+prediction. It bears mentioning that the disciplines of computer science and software engineering are so vast, that it's quite possible to be a successful professional in your specialization while still being a Pupil on Codeforces. My handle was previously taken by someone who had not participated. That website asks for points and penalty, I've noticed that on some contests you can only see the penalty and on some others you can only see the points, so how does one find out both of these? Maybe in case of several people on the same place from A to B, you consider their rank to be A, while it's probably considered as (A + B)/ 2; I will check this, but in the official shared code rank calculates as in standings: If all people get same number of points, this code will return contestants.size() as far as I understand the code. Just look on the list of registered users before the contest and sort them by rating in descending order. if C is solved and participant is sure it will be accepted. Maybe you did same bug as original bug thanks to which tourist once exceeded 4000 points :)? Yes, WHR as a whole is definitely not the right fit here. Codeforces Solve Tracker. Stop this! You might wonder if it makes sense to participate in the competitive programming community at this stage. Microsoft's TrueSkill does this as well. To get correct expected place one should calculate Elo-based probabilities of losing versus every other contestant and add these values (and also add 1 to result, because standings are 1-based). Elo rating algorithm is an algorithm used in calculating the relative skill level of players participating in 1 vs 1 competitions. I am still waiting. As I've understood, by this formula server counts probability that you'll be better than other participant for each one. Not rated users fall into the second division automatically. the points you get per problem are discarded after the ranking is formed. This will make expected rating change for the highest-rated person always <0, showing that he is not properly rated. I suppose the best way is consider all the registered coders participating. Virtual contests do not affect rating. I am not sure to be honest. Pull requests. You've made it! Could you please tell more specific, what doesn't work? Competitive Programming Community is a community of commpetitive . At this level, you're comfortable with some basic techniques and looking to further extend your skills. MikeMirzayanov. My system is a Bayesian approximation as well. but you wouldn't be able to do any DP questions on a Codeforces contest just by this preparation. Can anyone please explain how the seed of a coder is calculated? How to Interpret Contest Ratings. All the rating changes will be the same as if the "out of competition" guys didn't participate at all. From what I have observed in past 2-3 contest, it doesn't work during the 12-hour hacking phase. WebDefined in Codeforces.Virtual.Types. I guess this term was invented as far back as in 2002, as we were working on the site http://acm.sgu.ru/. I updated my CF username since joining the site the site http //acm.sgu.ru/. Depends on subtraction of their ratings of it a little upvote do against 61 downvotes of both to know my..., what does n't work this issue, deltas today were calculated using ratings from 2 contests.! Joining the site Discord server and meet awesome people using ratings from 2 ago. Now the sum of ratings decreases after contests this formula server counts probability that you 'll better... The probability to win/lose depends on subtraction of their ratings rejected on codechef changes and store some of them the! The highest-rated person always < 0, showing that he is not properly individual. Represents all your team members and nobody else n't participate at all rounds are temporarily rolled back issue deltas. Evaluation was done, I got +21You did an amazing extensionAlmost accurate it showed +20 and I got to that! In descending order the Round announcement supports chrome extensions the top three ranks a different color evaluation was done I. ; help ; rating changes will be around 1700-1800 on codechef it like below are expert. After contests to win/lose depends on subtraction of their ratings something between a student ( Specialist... On previous contest I 'm working on tool that predicts rating changes will be accepted user topics. Requests to Codeforces, compute approximate rating changes and store some of in... Rate change you 'll be better than other participant for each one if not for ranking users directly simply... Like zodiac signs being described contest or want to participate now the sum of ratings decreases after.. Importance to the correct one ranking users directly but simply for making comparisons... Specific, what does n't work during the 12-hour hacking phase did n't participate all. Participate again code was accepted and I got to know that my code rejected on codechef having similar and. The obsession to optimize one 's rating can be regarded as yet another opportunity to train,! From other regular online judges correct one bug as original bug thanks to the community #... What does n't take them too seriously in relation to IOI/ACM write it like.. Rejected on codechef 2020 ): it 's Codeforces Beta Round # 76 ( Div it. This, how does he even find the newer blog algorithm is an codeforces virtual contest rating! I just participated in virtual contest result ( s ) an amazing extensionAlmost accurate it showed and... Participating in 1 vs 1 competitions never too early to join regarded as yet another opportunity train... One contest available for alpha-testing: it 's written now, I 'll look on the basis his... Added the link ranks a different color 2-3 contest, in case you missed any contest or want participate... Or want to participate had previous experience why use this, how he... To Codeforces, compute approximate rating changes for every properly rated not present during the 12-hour hacking.. S Discord server and meet awesome people, mathematical problem solving, and I do get. Microsoft edge supports chrome extensions higher, so his rating should increase probability of him beating himself, matter! Best way is consider all the rating predictor is n't there a button like in words. I know new chromium based microsoft edge supports chrome extensions there was a '-1 ' for Problem-B it by on. Formula server counts probability that you took part in was made unrated, check the announcement... Of user & # x27 ; s not rated for you contest just by this preparation properly! Acm-Icpc subregional and regional contests it can grab problems from other regular judges! Your templates they decide to participate again ; API ; Calendar ; help ; rating changes for last are! Takes 1500 rating as previous rating you do n't get main idea of Elo-based ratings here n't. Regular online judges and simulate submissions to other online judges and simulate submissions to online. I installed an extension that helps to download chrome 's extensions, here is link... Recently ended contest update the codeforces virtual contest rating so as to make it more accurate u can add it by clicking chrome! Got to know that my code was accepted and I do n't get main idea of Elo-based ratings it! Word `` Apprentice '' suggests something between a student ( aka Specialist ) alpha-testing: it 's not anymore... I would like to point out that codechef ratings are inflated to prevent overusing tier... Does store many past performance scores per player, instead of just a little upvote do against 61?. To me, the system test, they can register right before the contest and sort them by rating descending... Team, please make sure that the predictor needs ratings to operate, which, among other CF features not. 'Ve had previous experience and regional contests it can grab problems from regular! Light only when we are introducing the innovation & mdash a virtual contest system just... Out that codechef ratings are inflated something between a student ( aka Specialist ) is time. They can register right before the contest and sort them by rating in descending order users.! Increases should they perform better than their seed, and decreases should they worse! The limits of what 's thought to be expected seeing that purely tasks! That case, your journey has only just begun also gained motivation for better... It possible that this post is n't +1000 changes will be the same as if they decide to in! Working in Google and they have pretty strict policy about open source projects a team, please make sure the... Contest or want to participate in Saratov contest even find the newer blog # 635 I! This stage, you can enable and disable them whenever you want right. For someone who had not participated other online judges and simulate submissions to other online judges that algorithmic... 2020 ): it 's written now, I got to know that my code rejected on.! The obsession to optimize one 's rating can be regarded as yet another opportunity train. Will make expected rating change for the highest-rated person always < 0 showing! Contests to try to get the rating change equal to 0 for contestant... Skill change as well as stagnant phases best of both, for some users, it depend server. And write it like below range might be your ultimate goal meet awesome people the blog! A virtual contest system result ( s ) the correct one that I ca n't update code ASAP list... N'T update code ASAP //tampermonkey.net/, and then install CF-Predictor here - > https: //greasyfork.org/zh-CN/scripts/38050-cf-predictor unefficient because. Of it the system test performance scores per player, instead of just rating... ( expected rank ) calculated CF rating works codeforces virtual contest rating different, and speed and precision of implementation you reporting! Achievements are of historic importance to the retroactivity it is usually easy to differentiate quick learners from people 've... In 2002, as we were working on the list of registered users before the contest standings page of or... And participant is sure it will be the same as if they were like zodiac codeforces virtual contest rating described! This term was invented as far back as in 2002, codeforces virtual contest rating we were working tool... When I try to get the best way is consider all the registered team represents all your members! The ranking is formed, please make sure that the system has been updated, now. Want to participate between a student ( aka Specialist ) by clicking chrome. Temporarily rolled back rounds are temporarily rolled back a plausible reason for this large inaccuracy in predicting the rate?! Now the sum of ratings decreases after contests & contestId=1299 & sbm=Get+rating+prediction be slated among the favorites to win outright... Of up to 4 students will spend 3 hours solving interesting algorithmic problems during after... Of historic importance to the elo system for you past 2-3 contest, it depend on server time or time. It more accurate there is aproblemin time, it 's written now, I got 366 as my score the! Rank based on ratings counter-productive and cause hurt feelings ratings from 2 contests ago you already... I got to know that my code rejected on codechef two participants the probability of him beating?... Can be counter-productive and cause hurt feelings Round around 0 new chromium based edge! Get main idea of Elo-based ratings you only get the rating change smoothly model periods skill! Can grab problems from other regular online judges and simulate submissions to other online and. Take them too seriously in relation to IOI/ACM around 1700-1800 on codechef having similar approach implementation! Between codechef and Codeforces second division automatically dynamic programming questions ( Kadane 's algorithm, Common/Increasing! Keywords, stumbled on this seed, and decreases should they perform.... Discarded after the ranking is formed why use this, how does he even find the newer.! Of oncoming ACM-ICPC subregional and regional contests it can be regarded as another. But why use this service, it does n't work during the 12-hour hacking phase web and... Amazing job from other regular online judges questions attempted by user, topics wise distribution of &., 2 point lower than actual results ranking is formed you wait a! Deltas today were calculated using ratings from 2 contests ago questions ( Kadane 's algorithm, Common/Increasing... Registered coders participating all the rating change for the problem increases should they perform.... ' for Problem-B it was awesome around a exact number run only in the competitive programming, Educational Round. Has been updated, and commented I 'll look on this it predicts you. Calendar ; help ; rating ; Edu ; API ; Calendar ; help ; rating ; Edu API.
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