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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.
For 372 you are right; nobody saw the mistake... I will correct it. For 119 you are right too:
[-7,1]since-7is divisible by seven.Good point and thanks for the feedback!