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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.
I chose a similar solution, but just did a > check on 'm' - in_array() goes through entries sequentially - so potentially expensive ...
(I doubt it's going to make any real difference here, unless the input string is really long!)