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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.
OP solved it, closing
RA ...its an abreviation ... Array ==> Arr-ay ==> RA
A ... is the array that's initially passed in ... again just abreviated to a single letter.
B ... another array based on A that has been transformed in a specific way. The names dont really matter since we're not repeating anything...