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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.
It's literally in the title of this kata, and in the description:
Trianguluar Numbers
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This is the easiest to read. I just used a regular if statement though.