context: It is probable that Lily is a swan. It is improbable that Bernhard is a frog. It is highly likely that John took the apple. There is a better than even chance that if John took the apple, and Bernhard is a frog, then Brian is a rhino. There is a better than even chance that if Lily is a swan, or Bernhard is a frog, then Fred left the milk. There is almost no chance that if either John took the apple, or Bernhard is a frog, then Greg is green.
hypothesis: Chances are about even that fred left the milk, or Greg is green.
valid_hypothesis: Chances are about even that fred left the milk, or Greg is green.
invalid_hypothesis: It is almost certain that fred left the milk, or Greg is green.
hypothesis_assertion: Fred left the milk, or Greg is green.