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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 added a sentence with your suggestion to the details:
"If all the words in the given array mesh together, then your code should return the meshed letters in a string. You should return the longest common substring. You won't know how many letters the meshed words have in common, but it will be at least one."
Thanks for that, I've raised an issue about it.