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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.
I kept getting 1-2 failures in the random tests. I saw that one case expected a return of 0, which indicated that 0 should be treated as a positive integer. Now it works.
Also having trouble with the random tests.