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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.
look at it this way:
"it works perfectly for all test cases [that happen to be the paritcular ones] on another compiler"
consider which tests appear here that are missing on this other compiler
it says it doesnt work but on another compiler it works perfectly for all test cases.