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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.
this is one of the easiest questions, BUT the explaination is wrong. Would have saved a lot o time had it been correct
well the logic they are using here is that "number of time each digit should be multiplied to itself = number of digits in the input"