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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.
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Also, it seems that ypur solution has 2 lines
You are not required to explicitly define the function. Consider how the test will invoke your function. If only there were a Greek method for assiging a function to a word....
an int has no length; user could have used list(str(num)), but otherwise, I don't see how that's unnecessary, given that ints are also not iterable
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You could do this without two for loops.
Kudos anyway!