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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.
I think there is no another way to have comment as spoiler.
Yes flag is for spoiler
First of all, you need to have spoiler when sharing code sample. Second, this is very basic logic. You need to think by any other perspective rather than optimizng that code. You need to impl. a function that returns nth reverse number rather than loopimg for all numbers