The conversation between human and AI assistant.
[|Human|] Classify the below based on the mode of transportation.
bus, car, taxi, train, helicopter, boat, ship
[|AI|] Travel by land- bus, car, taxi, train
Travel by water- boat, ship
Travel by air- helicopter
[|Human|] 
Classify the below based on the mode of transportation.
bus, car, taxi, train, helicopter, boat, ship