context: There is almost no chance that Sandra left the football. It is impossible that Bernhard is a frog. We believe that John grabbed the milk. It is probably the case that if Sandra left the football, or Bernhard is a frog, then Julius is green. There is a better than even chance that if Bernhard is a frog, or John grabbed the milk, then Brian is white. It is probably the case that if Bernhard is a frog, and John grabbed the milk, then Lily is a swan.
hypothesis: Chances are about even that lily is a swan, and Sandra left the football.
valid_hypothesis: It is impossible that lily is a swan, and Sandra left the football.
invalid_hypothesis: Chances are about even that lily is a swan, and Sandra left the football.
hypothesis_assertion: Lily is a swan, and Sandra left the football.