context: We doubt that Emily is a sheep. Chances are about even that Lily is a swan. We believe that Sandra left the football. It is highly unlikely that if either Sandra left the football, or Lily is a swan, then Gertrude is a wolf. Chances are slight that if either Lily is a swan, or Sandra left the football, then John dropped the apple. It is certain that if either Sandra left the football, or Emily is a sheep, then Mary went to the kitchen.
hypothesis: Chances are about even that either Sandra left the football, or Lily is a swan.
valid_hypothesis: Chances are about even that either Sandra left the football, or Lily is a swan.
invalid_hypothesis: It is highly unlikely that either Sandra left the football, or Lily is a swan.
hypothesis_assertion: Either Sandra left the football, or Lily is a swan.