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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.
Looks like require('vm') hole in JS has been fixed but with Ruby you can still access eval through RubyVM::InstructionSequence.
One test is still broken as mentioned below. In one of the tests there is a 12 so depending on how you are calculating your values this could pose a headscratcher.