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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.
next time your raise an issue, please provide some more evidence, e.g. your code (with a spoiler flag and markdown block). also, come back to close your issue once you realized the mistake was yours and you solved the kata
This means, that you have to optimize your code. Try to think of a way how you can make your code find the solution faster.