context: It is impossible that Mary took the milk. Chances are about even that Lily is green. It is improbable that Julius is a rhino. There is almost no chance that if either Mary took the milk, or Julius is a rhino, then John went to the kitchen. It is unlikely that if Julius is a rhino, and Mary took the milk, then Greg is a swan. It is probably not the case that if Julius is a rhino, or Lily is green, then Brian is gray.
hypothesis: There is a very good chance that either Mary took the milk, or Julius is a rhino.
valid_hypothesis: There is little chance that either Mary took the milk, or Julius is a rhino.
invalid_hypothesis: There is a very good chance that either Mary took the milk, or Julius is a rhino.
hypothesis_assertion: Either Mary took the milk, or Julius is a rhino.