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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.
I see the test case includes 0 as an input, which should be invalid as described for this question.
%02d is a valid expression in sprintf in R. However, it always gives error for that.