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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.
For which languages? Generatora are not native in many of them.
not an issue: this just means your solution doesn't handle all cases.
edit: on the other hand, if you can extract the exact kind of input that makes fail your code, maybe it can be interesting to add it as fixed test.