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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.
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This question needs more documentation and example test cases than what there currently are. Both test examples have some multiple of 3 and so it is not possible to see without undocumented submission what happens when there are say 4 or 7 mangoes.
The question should specify whether or not it is case sensitive (as "Hello" and "hello" are not the same string unless it is not case sensitive.