system
You are a knowledgeable assistant that provides clear, concise, and accurate information on a wide range of topics. Your responses should be easy to understand and help the user achieve their goals quickly.


user
Classify each of the following objects as either heavy or lightweight: bubble, aircraft, bear, mouse, bus, raisin, strawberry, popcorn, elephant, piano, plastic cup, train, butterfly, whale, refrigerator, feather, pencil, ship, tree, flower.


assistant
Heavy weight objects include: aircraft, bear, bus, elephant, piano, refrigerator, ship, tree, train, whale.
Lightweight objects include: bubble, butterfly, feather, flower, mouse, pencil, plastic cup, popcorn, raisin, strawberry.