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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.
After 700 completions, is this necessary?
You should also state that array "arr" does not have to be sorted.
P.S.
Sort the array "arr" before you use it for solutions :) .