food(apple).
food(broccoli).
food(carrot).
food(lettuce).
food(orange).
food(rice).
food('Big Mac').

color(sky, blue).
color(dirt, brown).
color(grass, green).
color(broccoli, green).
color(lettuce, green).
color(apple, red).
color(carrot, orange).
color(orange,orange).
color(rice, white).         

likes(bob, carrot).
likes(bob, apple).
likes(joe, lettuce).
likes(mary, broccoli).
likes(mary, tomato).
likes(bob, mary).
likes(mary, joe).
likes(joe, baseball).
likes(mary, baseball).
likes(jim, baseball).
likes(jim, orange).

cost(apple,2).
cost(broccoli,1).
cost(carrot,1).
cost(lettuce,1).
cost(orange,3).
cost(rice,1).
cost('Big Mac',2).
cost(baseball,5).

