context: A young man wearing a green shirt and a hat attempts a trick on a skateboard while riding it in a skate park next to a beach.
hypothesis: There is a very good chance that a teen is practicing his skateboard skills.
valid_hypothesis: There is a very good chance that a teen is practicing his skateboard skills.
invalid_hypothesis: Chances are slight that a teen is practicing his skateboard skills.
hypothesis_assertion: A teen is practicing his skateboard skills.