context: A man in a straw hat shades his phone while others walk on a busy sidewalk.
hypothesis: It is certain that the man is trying to see his phone in the sun.
valid_hypothesis: It is certain that the man is trying to see his phone in the sun.
invalid_hypothesis: Chances are about even that the man is trying to see his phone in the sun.
hypothesis_assertion: The man is trying to see his phone in the sun.