context: man doing carpentry or construction on top of an unfinished building.
hypothesis: It is impossible that the man didn't know if he was a construction worker or carpenter.
valid_hypothesis: It is impossible that the man didn't know if he was a construction worker or carpenter.
invalid_hypothesis: There is a better than even chance that the man didn't know if he was a construction worker or carpenter.
hypothesis_assertion: The man didn't know if he was a construction worker or carpenter.