“Oh! I see. The general rule is to calculate at the ratio between the alcohol content and the tannin content expressed in these units, take that number mod 7, then take the numeric equivalent of the first letter of the main ingredient of the dish in German and take that mod 7, and match wines to dishes based on those two matching numbers.”
http://xkcd.com/1155/ :-)
I spent an embarrassingly long time after that xkcd trying to devise “compact” directions to my house from various places.