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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.
Depends what country you're in.
I've got the same solution (I used combinatorics)
the interesting thing is that in real life yellow goes past red, not green :D
This does not work for ending = ''