premise1: A man flies through the air on his skateboard above a white staircase.
premise2: A boy in a blue shirt jumps down stairs on a skateboard.
premise3: A skateboarder jumps his board down a flight of stairs.
premise4: A skateboarder sails over white steps.
premise: A man flies through the air on his skateboard above a white staircase. A boy in a blue shirt jumps down stairs on a skateboard. A skateboarder jumps his board down a flight of stairs. A skateboarder sails over white steps.
hypothesis: Skater jumping.