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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.
O(n) solution using Data.Sequence as a Queue. Also wanted to separate the xbonacci desired numbers call from the actually xbonacci series.
I make an infinite series by getting the "value (sum)" of the window then shifting the WindowSum down by adding the val to the end and popping off the front.