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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.
7 ^ 16?It has been answered many times already, months and months ago (you can even find my own question about this very case). I don't remember the logic exactly, but ALL CASES ARE VALID, and
7**6**21 % 10 == 1.Why should it be 9?