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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 would add "except for the id column" at the end of "concatenate all columns together" as that's what the test case has. Also I would specify that you're looking for a query/select statement instead of created table.
I'm assuming the assumption is that the two strings will always share the letter?