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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.
Great code! - but it seems like you made an error in your inner for loop. Your limit is the length of the array, but it looks like it should be the length of the string that you are looping through at array[i] -ie. j < array[i].length?