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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
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This code works because the function was renamed from 'pipeFix' to 'pipe__fix'. Somebody mentioned this being more in line with the correct sytle in the comments. It runs the first smaller set of test cases, but then fails the submission. So I'm guessing that they changed the submission tests, but not the smaller set of test cases.