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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.
Sorry, my fault. I overlooked that line. Thank you for correcting me.
I think the description is not very clear. Number was provided in string type but not mentioned. Also the expected behaviour of less then 5 digits input was not specified.