context: There is little chance that Brian is a rhino. We believe that Lily is a frog. It is probable that Greg is yellow.
hypothesis: It is probably the case that either Brian is a rhino, or Greg is yellow.
valid_hypothesis: It is probably the case that either Brian is a rhino, or Greg is yellow.
invalid_hypothesis: It is impossible that either Brian is a rhino, or Greg is yellow.
hypothesis_assertion: Either Brian is a rhino, or Greg is yellow.