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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 don't think it needs O(n^2) since the smiley array size is constant. So it would be O(n) still.
ˈ - it is ASCHII symbol which is very similar to single quot, but it can be a name of variable :)