Silvia and her brother Clyde make a code of rules they have to follow together. The rules are as follows: I) If Silvia bakes a cake, then Clyde can eat as much of it as he wants.

II) Silvia and Clyde can only go to movies they are both interested in seeing.

III) Every time Clyde borrows Silvia's car, he must put some gas in it. Silvia must do the same when she borrows Clyde's motorcycle.

IV) If Clyde makes a cobbler, Silvia can eat as much of it as she wants.

Which ethical philosophies are represented in these rules?