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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.
e refers to element in the array of the current itteration and i the index of the element in the current itteration on each itteration we are substraction the index i from the input number n populating the array with decreasing numbers from first number n each time by 1