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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.
Read the name of the Kata ;-)
They are consistent, you have to figure out how.
the result of the test cases don't seem consistent.
how [1,2] and [3,4] can yield [1,2,3,4] but [1,1] and [2,2] only yields [1,2] instead of [1,1,2,2] is a mystery to me.