context: It is highly unlikely that Jeff went to the kitchen. It is certain that Greg is a frog. Chances are slight that John left the milk. It is improbable that if Jeff went to the kitchen, or Greg is a frog, then Brian is green. There is little chance that if Greg is a frog, or John left the milk, then Lily is a lion. It is probably not the case that if Greg is a frog, or John left the milk, then Julius is a rhino.
hypothesis: It is impossible that either Lily is a lion, or Greg is a frog.
valid_hypothesis: It is highly likely that either Lily is a lion, or Greg is a frog.
invalid_hypothesis: It is impossible that either Lily is a lion, or Greg is a frog.
hypothesis_assertion: Either Lily is a lion, or Greg is a frog.