context: It is probably the case that Lily is a swan. It is probably not the case that Winona is a mouse. It is likely that Julius is a rhino. We doubt that if Winona is a mouse, or Lily is a swan, then John got the milk. Chances are slight that if either Lily is a swan, or Winona is a mouse, then Fred is in the bedroom. We believe that if either Lily is a swan, or Julius is a rhino, then Mary went to the office.
hypothesis: It is almost certain that either Mary went to the office, or John got the milk.
valid_hypothesis: Chances are about even that either Mary went to the office, or John got the milk.
invalid_hypothesis: It is almost certain that either Mary went to the office, or John got the milk.
hypothesis_assertion: Either Mary went to the office, or John got the milk.