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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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Why would it expect Arsenal in uppercase if the instruction said to return it in lower case if the max reminder is an even number. Here is the example below.
[ 56, 120, 119, 11, 20, 20 ]
16
Expected: ''ARSENAL'', instead got: ''arsenal''