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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 tihnk that you got description wrong way. You shouldn't focus on single characters of strings - you should focus on strings that are already provided in the strattr. Your task is to find longest string that can be created from consecutive (k) list elements (if there can be two strings with equal length, take first one).