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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.
There needs to be a space after the comma. When you cast an array into a string without a delimiter, the default is a comma with no space. If you look at your screenshot again, you can see that a space is missing after the comma for the actual solution and there is a space in the expected solution.