context: It is unlikely that Greg is a rhino. Chances are slight that Sandra left the apple. It is certain that Gertrude is a mouse. We doubt that if Gertrude is a mouse, or Greg is a rhino, then John moved to the office. Chances are slight that if Greg is a rhino, and Gertrude is a mouse, then Brian is a frog. It is certain that if Greg is a rhino, and Sandra left the apple, then Julius is a swan.
hypothesis: It is highly likely that either Greg is a rhino, or Brian is a frog.
valid_hypothesis: We doubt that either Greg is a rhino, or Brian is a frog.
invalid_hypothesis: It is highly likely that either Greg is a rhino, or Brian is a frog.
hypothesis_assertion: Either Greg is a rhino, or Brian is a frog.