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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.
Also computationally inefficient, because each time an element gets evaluated, it is compared with all the existing lists. But I loved the functional approach.
This will fail with a long enough number
This is an example of a failing test case:
triplets = [['t', 'u', 'p'], ['w', 'h', 'i'], ['t', 's', 'u'], ['a', 't', 's'], ['h', 'a', 'p'], ['t', 'i', 's']]