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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.
Why do you want a code working for numbers > 9 if the description states explicitly
Numbers can be from 1 to 9
?but only works with numbers from 0-9. If there is for example 12 it sorts by 1, 12, 2, 3 .....