context: It is probably not the case that Mary went to the garden. It is highly unlikely that Sandra grabbed the apple. There is a better than even chance that Bernhard is a rhino. We doubt that if Mary went to the garden, and Bernhard is a rhino, then Greg is white. It is impossible that if either Mary went to the garden, or Bernhard is a rhino, then Brian is a lion. It is unlikely that if Sandra grabbed the apple, or Bernhard is a rhino, then Lily is gray.
hypothesis: It is impossible that sandra grabbed the apple, and Greg is white.
valid_hypothesis: It is impossible that sandra grabbed the apple, and Greg is white.
invalid_hypothesis: Chances are about even that sandra grabbed the apple, and Greg is white.
hypothesis_assertion: Sandra grabbed the apple, and Greg is white.