context: It is impossible that Mary picked up the apple. It is probable that John put down the apple. It is highly unlikely that Julius is a rhino. There is a very good chance that if either Mary picked up the apple, or John put down the apple, then Brian is green. We believe that if John put down the apple, and Mary picked up the apple, then Lily is a frog. We believe that if John put down the apple, or Mary picked up the apple, then Sandra got the football.
hypothesis: Chances are slight that either Brian is green, or Lily is a frog.
valid_hypothesis: There is a better than even chance that either Brian is green, or Lily is a frog.
invalid_hypothesis: Chances are slight that either Brian is green, or Lily is a frog.
hypothesis_assertion: Either Brian is green, or Lily is a frog.