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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.
Got it, thanks!
As many of the other comments have noted, probably more difficult than an 8 kyu. I was also using .pop(), which passed all the tests but got a different error. Not sure what caused it?
No real description on what is the expected output, poor Kata.