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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.
This one is easiest to understand for beginners. No use of complex functions like array_reduce or preg_replace.
Wait, isn't array_shift function removes the first element of an array?