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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.
No.
Return the first comparing first, then second indices ( third index follows from first and second, so that's not useful to compare ).
Is this called "lexicographically first" ?
"Turn math function into a program" is a bad kata idea. Moreover, calculating a vector product is not new either.