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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.
Why haven't you written your own FILTER function as well?
I can't stop laughing
He is an author of "KEEP IT SIMPLE" methodology
He invented KISS