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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.
0 and 1 are the only single digit numbers that are Armstrong numbers (using the definition given in the kata instructions).
I don't think this kata will be approved because it is marked as a duplicate (see other comments below).