User: Classify each of these vehicles, based on whether they are two wheel vehicles, or four wheels vehicles: car, Gyrocar, van, motorbike, scooter, all-terrain vehicle (ATV), bicycle and Segway.
Assistant: Vehicles with two wheels include: bicycle, motorbike, scooter, Gyrocar, and Segway.
Vehicles with four wheels include: car, van, all-terrain vehicle (ATV)