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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.
my comment was 2 years ago, i think it was originally meant for someone that wasnt checking for empty first (or size>0). its fine if checking size/empty first and is well defined. again, it was 2 years ago, so i dont recall exactly at that time ;).
Yes, index is out of range and can lead to undefined behavoir. Should really be checking for i>0 and i<fight.size()-1
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