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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.
The last line of kata description literally asks to modify the input not create a new one
No, this just means that you can't travel diagonally between each location in the maze/map.
why I don't know '.count()'