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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.
You are right about that, an if statement checking at the start could save a little bit of processing time in case of an odd number of items. I think for of is more style choice, nothing wrong with a basic for loop in my opinion
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This comment is hidden because it contains spoiler information about the solution