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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.
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like break after missingLetter = arra[i] + 1; ?
I think using a 'return' clause inside the loop will save unnecessary iterations when we already have the desired output. Boolean conditions are easier to read in my opinion, but tend to have longer run times.