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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.
This solution makes additional passes in the loop and requires the filter. Would be better to first find out how many n-length arrays required by using this formula:
let numOfArr = array.length - n + 1;