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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.
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Upon going through this discussion, the following instructions may help in solving the kata:
"Find the greatest difference in length for any possible pairing of strings between Array1 and Array2".