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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.
There're already numerous
O(n)solutions to the original kata which can be trivially copied from there.I don't think
3.14159is either an even number or an odd number, since it's not even an integer.