context: It is almost certain that Greg is a rhino. It is highly likely that Julius is a frog. Chances are slight that Brian is gray.
hypothesis: There is little chance that julius is a frog, and Brian is gray.
valid_hypothesis: There is little chance that julius is a frog, and Brian is gray.
invalid_hypothesis: There is a better than even chance that julius is a frog, and Brian is gray.
hypothesis_assertion: Julius is a frog, and Brian is gray.