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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.
as i understood, s can be empy if both part1 and part2 are empty
I have same problem, even i write something like this and it does not work, if return true or false