context: It is improbable that Greg is a frog. It is highly unlikely that Brian is a rhino. Chances are slight that Bernhard is white. It is probably the case that if Brian is a rhino, and Greg is a frog, then Mary went to the hallway. It is likely that if Greg is a frog, and Bernhard is white, then Jason is hungry. There is a very good chance that if either Bernhard is white, or Brian is a rhino, then Lily is green.
hypothesis: It is certain that either Brian is a rhino, or Bernhard is white.
valid_hypothesis: Chances are slight that either Brian is a rhino, or Bernhard is white.
invalid_hypothesis: It is certain that either Brian is a rhino, or Bernhard is white.
hypothesis_assertion: Either Brian is a rhino, or Bernhard is white.