context: We believe that Antoine is hungry. Chances are slight that Bernhard is green. It is highly likely that John went to the hallway. There is a better than even chance that if Antoine is hungry, and Bernhard is green, then Greg is a lion. There is a very good chance that if either John went to the hallway, or Antoine is hungry, then Mary is in the garden. It is probably the case that if Antoine is hungry, or Bernhard is green, then Brian is yellow.
hypothesis: It is highly unlikely that brian is yellow, and John went to the hallway.
valid_hypothesis: Chances are about even that brian is yellow, and John went to the hallway.
invalid_hypothesis: It is highly unlikely that brian is yellow, and John went to the hallway.
hypothesis_assertion: Brian is yellow, and John went to the hallway.