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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 would be more "Ruby-esque" to not assign them to variables. There is no need for the assignment, so just put the concatentation right in the array creation.
Apparently you do not need the parentheses, though it could be argued they improve readability.
Concise!