I have a game I am working on that uses a system to produce products to sell. This system involves turning in a pair of "goods" to produce 1 "product" (this can be done as many times as you want, but that is beside the point). Now, there are 3 goods: "A", "B", and "C". There are also 3 products you can make from goods: "AB", "AC", and "BC". So, in order to make "AB" products, you must have "A" and a "B" pairs.
Now notice that each good is combined with each other; That's my problem. How do you find thematic sense in that system?
The closest I've got is with these goods: Water, Grain, and Logs. Water + Grain = Bread; Water + Logs = Paper; Grain + Logs = ???... got no idea.
Could you help me out? It sure is bugging me.