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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.
letters is a list of all the different letters in the string, and the for loop is just repeatedly looking a the triplets
eg. if triplets=[[1,2],[3,4]] then letters is a list containing 1,2,3,4 in any order, and t will be [1,2] and [3,4], 4 times each