premise1: Daredevils enjoy mountain boarding down the ravine.
premise2: Men skateboarding down a hill with helmets on.
premise3: Two guys are on skateboards in the woods.
premise4: Two men skateboarding in the forest.
premise: Daredevils enjoy mountain boarding down the ravine. Men skateboarding down a hill with helmets on. Two guys are on skateboards in the woods. Two men skateboarding in the forest.
hypothesis: Man on a motorcycle performing a trick.