context: Chances are about even that Lily is a swan. There is almost no chance that John put down the milk. There is little chance that Greg is yellow. There is almost no chance that if Greg is yellow, and Lily is a swan, then Mary went to the garden. It is probable that if either John put down the milk, or Greg is yellow, then Brian is a rhino. It is likely that if either Lily is a swan, or John put down the milk, then Jessica is a mouse.
hypothesis: It is almost certain that either Brian is a rhino, or Lily is a swan.
valid_hypothesis: Chances are about even that either Brian is a rhino, or Lily is a swan.
invalid_hypothesis: It is almost certain that either Brian is a rhino, or Lily is a swan.
hypothesis_assertion: Either Brian is a rhino, or Lily is a swan.