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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.
Thanks. I overlooked that condition.
Why does this work for the first element? What is ch compared with for i=0? With the last element of the sequence iterable[-1]? Tricky! But I'm not sure if in a good way or a bad way ;)