context: It is impossible that Greg is gray. We believe that Brian is a rhino. There is little chance that Julius is a frog.
hypothesis: We believe that julius is a frog, and Greg is gray.
valid_hypothesis: It is impossible that julius is a frog, and Greg is gray.
invalid_hypothesis: We believe that julius is a frog, and Greg is gray.
hypothesis_assertion: Julius is a frog, and Greg is gray.