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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.
You are altering the list used by the test. Try to work on a copy or to not use destructive operation like python's pop.
Same issue, in Ruby. The kata is impossible to finish with these errors on testing.