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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.
XXL is not a correct roman number.
If you mean 30, it is expressed XXX. Only 40 would be expressed as XL, which works fine
That's not what the error says, it says:
Meaning your code returned
'up'when it should have returned'taxi'instead.