context: A man in a hard hat and orange safety vest works on a machine in smoky air.
hypothesis: It is highly unlikely that an old man in a hard hat and orange safety vest works on a yellow maching in smokey air.
valid_hypothesis: It is highly unlikely that an old man in a hard hat and orange safety vest works on a yellow maching in smokey air.
invalid_hypothesis: It is certain that an old man in a hard hat and orange safety vest works on a yellow maching in smokey air.
hypothesis_assertion: An old man in a hard hat and orange safety vest works on a yellow maching in smokey air.