context: It is highly unlikely that Greg is white. Chances are about even that Gertrude is a sheep. Chances are about even that Julius is a rhino.
hypothesis: Chances are about even that julius is a rhino, or Greg is white.
valid_hypothesis: Chances are about even that julius is a rhino, or Greg is white.
invalid_hypothesis: It is certain that julius is a rhino, or Greg is white.
hypothesis_assertion: Julius is a rhino, or Greg is white.