yes I got the same thing :) I am not sure what to use this for now,,, I have yet to see any skill that requires it any clues would be helpful :) thank you
The (4) combine version uses 4 vegetable and 4 waters (makes sense), but it only allows 1 skill-up possibility - or so it seems. I'd assume the (4) version would be used by higher skill levels to make more per click - for other combines.