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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.
nope, there is another last test and your solution is failing on this one (it's the hardest test of the test suite).
(EDIT: actually, don't think about optimizing further, considering your other timings. You'd rather need to explore the situation to understand why your code cannot handle this special test)
wrong:
meaning the tests are shit in JS... :/