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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.
Probably one test in at least ruby version is wrong, since it expects vowel? on "Y" to return false, but
"There are six vowel letters in the English alphabet: a, e, i, o, u, y." - first google result.