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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 problem description is poorly worded, but should say "one digit numbers".
Because they're two digits.
Hi Alveek
A digit is a single number, so anything from 0 to 9.
14 is two digits (1 and 4).