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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.
It would be good to add test for an input in the form of "1:041:44" or "123456::" if we really want to test for any possible string input. My solution (C#) passed, even though I just check if there are 6 digits and two colons in the input. Which is wrong, a solution shouldn't pass unless it checks whether the format follows the digit-digit-colon-digit-digit-colon-digit-digit pattern.
If the result is an array with two elements, they need be in the same order as they appear in the input. Otherwise, it seems the tests will not pass.