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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.
This test is in JS too.
One of the python test cases starts with a +, which seems to go against the rules that any leading + on a polynomial will be hidden.