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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.
You don't use an IDE or other editor? Madman!
Bad. Very low performance. You call #generateMap twice in #variance. Also you sum Double wrapper objects. It call many box and unbox operation, this operations is slow.