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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.
It might be helpful to clarify in the description that all the test cases will be in the range 1-3999 (the range expressible in basic roman numerals).
Otherwise, a nice Kata which handily illustrates how bonkers roman numerals are =)