context: It is highly likely that Sandra got the milk. It is unlikely that Bernhard is a swan. It is probably the case that Lily is a frog. Chances are about even that if Lily is a frog, and Sandra got the milk, then Fred left the football. It is probably the case that if either Sandra got the milk, or Lily is a frog, then Mary went to the kitchen. There is little chance that if Bernhard is a swan, and Lily is a frog, then Julius is gray.
hypothesis: It is likely that fred left the football, or Lily is a frog.
valid_hypothesis: It is likely that fred left the football, or Lily is a frog.
invalid_hypothesis: It is impossible that fred left the football, or Lily is a frog.
hypothesis_assertion: Fred left the football, or Lily is a frog.