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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.
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Solution of reference s123456789, i know the function 'circle' can be improved，because num <= 255, so the first place is merchant and the second place is divisor.
eg. ①cause A..Z <=> a..z ②So Aba <=> aba <=> AbA => )()
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