context: It is likely that Bernhard is a frog. Chances are slight that Sandra left the apple. Chances are about even that Antoine is thirsty. It is impossible that if either Sandra left the apple, or Antoine is thirsty, then Greg is a swan. It is highly unlikely that if either Sandra left the apple, or Bernhard is a frog, then Brian is white. There is little chance that if either Sandra left the apple, or Bernhard is a frog, then John put down the apple.
hypothesis: We believe that brian is white, and Antoine is thirsty.
valid_hypothesis: There is almost no chance that brian is white, and Antoine is thirsty.
invalid_hypothesis: We believe that brian is white, and Antoine is thirsty.
hypothesis_assertion: Brian is white, and Antoine is thirsty.