context: It is almost certain that Julius is a rhino. It is unlikely that Brian is a frog. There is almost no chance that Bernhard is a lion. It is highly unlikely that if Bernhard is a lion, or Brian is a frog, then Lily is white. Chances are slight that if Brian is a frog, or Julius is a rhino, then Mary grabbed the milk. It is probably not the case that if Julius is a rhino, and Bernhard is a lion, then Greg is a lion.
hypothesis: It is impossible that greg is a lion, and Brian is a frog.
valid_hypothesis: It is impossible that greg is a lion, and Brian is a frog.
invalid_hypothesis: It is probably the case that greg is a lion, and Brian is a frog.
hypothesis_assertion: Greg is a lion, and Brian is a frog.