:-dynamic(item/2).
:-dynamic(price/2).
:-dynamic(discount/2).
:-dynamic(dontmix/2).

item(toaster, 'Deluxe Toast-a-matic').
item(antfarm, 'Ant Farm').
item(dip, 'French Onion Dip').
item(twinkies, 'Twinkies').
item(lips, 'Chicken Lips').
item(hamster, 'Hamster').
item(rocket, 'Model rocket w/ payload bay').
item(scissors, 'StaySharp Scissors').
item(rshoes, 'Running Shoes').
item(tiger, 'Sumatran tiger').
item(catnip, '50-pound bag of catnip').

price(toaster, 14.00).
price(antfarm, 7.95).
price(dip, 1.29).
price(twinkies, 0.75).
price(lips, 0.05).
price(hamster, 4.00).
price(rocket, 12.49).
price(scissors, 2.99).
price(rshoes, 59.99).
price(tiger, 749.95).
price(catnip, 19.95).

discount(antfarm, 20).
discount(lips, 40).
discount(rshoes, 10).

dontmix(lips,dip).
