context: It is highly unlikely that Brian is a frog. Chances are about even that Emily is a mouse. We believe that Lily is a rhino. There is a very good chance that if Brian is a frog, or Emily is a mouse, then Daniel left the milk. Chances are slight that if either Emily is a mouse, or Lily is a rhino, then Mary went to the bedroom. It is highly unlikely that if either Lily is a rhino, or Emily is a mouse, then Bernhard is a lion.
hypothesis: It is certain that either Lily is a rhino, or Emily is a mouse.
valid_hypothesis: Chances are about even that either Lily is a rhino, or Emily is a mouse.
invalid_hypothesis: It is certain that either Lily is a rhino, or Emily is a mouse.
hypothesis_assertion: Either Lily is a rhino, or Emily is a mouse.