context: There is little chance that Mary left the apple. We believe that John is in the hallway. It is highly likely that Greg is a lion. It is highly likely that if Greg is a lion, and Mary left the apple, then Julius is a swan. It is probably the case that if Mary left the apple, and John is in the hallway, then Jeff went to the garden. Chances are slight that if either Greg is a lion, or John is in the hallway, then Brian is a rhino.
hypothesis: It is probably not the case that either Jeff went to the garden, or John is in the hallway.
valid_hypothesis: It is probable that either Jeff went to the garden, or John is in the hallway.
invalid_hypothesis: It is probably not the case that either Jeff went to the garden, or John is in the hallway.
hypothesis_assertion: Either Jeff went to the garden, or John is in the hallway.