premise1: A boy in blue jumps his skateboard off some steps while his friends watch.
premise2: A boy in blue jumps on a skateboard while two others watch him
premise3: A group of skaters are at a skate park.
premise4: Three skateboarders are in a park.
premise: A boy in blue jumps his skateboard off some steps while his friends watch. A boy in blue jumps on a skateboard while two others watch him A group of skaters are at a skate park. Three skateboarders are in a park.
hypothesis: A man performing a skateboarding trick.