context: It is highly likely that Brian is a rhino. We doubt that Julius is a rhino. It is likely that Greg is white.
hypothesis: We doubt that julius is a rhino, and Brian is a rhino.
valid_hypothesis: We doubt that julius is a rhino, and Brian is a rhino.
invalid_hypothesis: It is certain that julius is a rhino, and Brian is a rhino.
hypothesis_assertion: Julius is a rhino, and Brian is a rhino.