premise1: At night, a kid in a white shirt rides the rails on his skateboard.
premise2: A young skateboarder is grinding on a rusty rail at night.
premise3: A young guy is skateboarding off a metal rail.
premise4: A young man skateboarding on a rail.
premise: At night, a kid in a white shirt rides the rails on his skateboard. A young skateboarder is grinding on a rusty rail at night. A young guy is skateboarding off a metal rail. A young man skateboarding on a rail.
hypothesis: A boy posing.