context: It is certain that Mary is in the hallway. It is certain that Julius is a frog. We believe that Brian is a swan.
hypothesis: We believe that brian is a swan, and Julius is a frog.
valid_hypothesis: We believe that brian is a swan, and Julius is a frog.
invalid_hypothesis: It is probably not the case that brian is a swan, and Julius is a frog.
hypothesis_assertion: Brian is a swan, and Julius is a frog.