context: It is improbable that Mary went to the garden. Chances are slight that Greg is a rhino. We believe that Lily is gray. It is certain that if Mary went to the garden, and Greg is a rhino, then Gertrude is a mouse. Chances are slight that if either Greg is a rhino, or Mary went to the garden, then John got the apple. It is impossible that if Lily is gray, and Greg is a rhino, then Emily is a sheep.
hypothesis: It is impossible that mary went to the garden, and John got the apple.
valid_hypothesis: It is impossible that mary went to the garden, and John got the apple.
invalid_hypothesis: It is probably the case that mary went to the garden, and John got the apple.
hypothesis_assertion: Mary went to the garden, and John got the apple.