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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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i still didnt get it(
41 should equal 17 (test case 25)
this is the answer i get and it is correct, WHY 17??
12345678910111213141516171819202122232425
how come this has 17 digits??