What I want it to do is find ONLY a single word pair from each line in the file it looks at. So the the line "Joe works hard" will only return "Joe works" as a word pair, and not also return "works hard." In other words, I only want it to find one pair per line.
I'm sort of confused by this statement. Is there any criteria for selecting a word pair? Or do you always want to select the first two words on a line as the word pair?