context: A man wearing yellow sneakers and a black vest is on a water board and hangs onto a waterski line that appears to be towed by a boat.
hypothesis: Chances are about even that a man on a lake is learning how to waterboard slowly.
valid_hypothesis: Chances are about even that a man on a lake is learning how to waterboard slowly.
invalid_hypothesis: It is highly unlikely that a man on a lake is learning how to waterboard slowly.
hypothesis_assertion: A man on a lake is learning how to waterboard slowly.