context: It is highly unlikely that Brian is a lion. We believe that Julius is a swan. Chances are slight that Mary went to the office. It is probable that if Mary went to the office, and Brian is a lion, then Lily is white. It is almost certain that if either Mary went to the office, or Brian is a lion, then Greg is a rhino. It is improbable that if Brian is a lion, and Julius is a swan, then Bernhard is yellow.
hypothesis: There is little chance that greg is a rhino, and Mary went to the office.
valid_hypothesis: There is little chance that greg is a rhino, and Mary went to the office.
invalid_hypothesis: It is almost certain that greg is a rhino, and Mary went to the office.
hypothesis_assertion: Greg is a rhino, and Mary went to the office.