context: We doubt that Greg is a lion. It is impossible that Mary went to the garden. Chances are about even that Sandra left the football. It is improbable that if either Greg is a lion, or Sandra left the football, then Bernhard is a swan. It is highly unlikely that if Greg is a lion, or Mary went to the garden, then Brian is a rhino. It is unlikely that if Greg is a lion, and Sandra left the football, then John dropped the apple.
hypothesis: There is almost no chance that brian is a rhino, or Mary went to the garden.
valid_hypothesis: There is almost no chance that brian is a rhino, or Mary went to the garden.
invalid_hypothesis: It is highly likely that brian is a rhino, or Mary went to the garden.
hypothesis_assertion: Brian is a rhino, or Mary went to the garden.