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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.
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the direction was to write the factorial function not to import the existing one
11231
11[12.23,31 and 11] <= from first
11231 for 3
112[123,231, 311,111]
See there: https://docs.codewars.com/training/troubleshooting/
in case this helps, pay attention to the non-alphabet characters
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