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Loading collection data...
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.
great!
cause the element in set() is single, and it will delete the repeated
so am I !
relax
thank you very much ! I have the same idea with you, but fail to count the single letter. thank you !