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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 so yes
reducer can take up to 4 arguments, you can just omit the last two, which are indices and array. So you can use acc and value of the index.
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is this solution considered any good?
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