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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 was specifically getting clarification on requirements. Requirements get updated as they become more clear. Please don't condescend in environments like this as it is extremely unhelpful.
Honestly, the description doesn't account for a scenario where the carry occurs within the number and not at the far right.
The description should definitely say:
"Only when there is a carry digit is the result different from real addition.""
The meme does not provide an example for all cases.
According to the limited rules, shouldn't add(2, 11) => 31 not the expected 13?