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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.
Please clarify the description:
"... when they are an exact match, and appending the second string to the first if they are not.
NOTE: The strings may be empty."
Because these cases are not really clear from the given examples.
Thank you!