context: We believe that Lily is a frog. It is probably the case that Sandra got the milk. It is unlikely that Mary went to the office. It is impossible that if Lily is a frog, or Sandra got the milk, then Brian is green. It is highly unlikely that if Mary went to the office, or Sandra got the milk, then Julius is a swan. It is highly unlikely that if either Mary went to the office, or Lily is a frog, then John left the football.
hypothesis: We doubt that either Julius is a swan, or Sandra got the milk.
valid_hypothesis: It is likely that either Julius is a swan, or Sandra got the milk.
invalid_hypothesis: We doubt that either Julius is a swan, or Sandra got the milk.
hypothesis_assertion: Either Julius is a swan, or Sandra got the milk.