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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.
OP solved it, closing
Agree, this is horribly worded. I thought we had to find common characters in both strings and then remove duplicates.
I believe you are to combine two strings into one, remove any duplicate letters, sort the string in alphabetical order, and return the largest possible string that has all unique characters.