context: A boy in a red shirt with arms outstretched on the side of hill.
hypothesis: It is certain that a boy is pretending to be an airplane as he runs around on a hill.
valid_hypothesis: Chances are about even that a boy is pretending to be an airplane as he runs around on a hill.
invalid_hypothesis: It is certain that a boy is pretending to be an airplane as he runs around on a hill.
hypothesis_assertion: A boy is pretending to be an airplane as he runs around on a hill.