Seeking clarity for increment and return count section

Following along so far with no problems. No problems running the program so far and when I mentally run through what’s happening it all makes sense, until I get to one part which seems fuzzy to me. The line where we set up the increments and return counts is unclear to me. I have posted an image with the exact line that’s causing me a headache. Can someone explain what this line means, part by part? Much thanks!

It says FBullCowGame::SubmitGuess returns an FBullCowCount and has one parameter of type FString and the variable for that is called “guess”

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