context: Chances are slight that Gertrude is a mouse. It is improbable that John discarded the apple. It is improbable that Lily is a lion. It is highly unlikely that if either John discarded the apple, or Gertrude is a mouse, then Bernhard is a swan. It is probably not the case that if Lily is a lion, and John discarded the apple, then Brian is a frog. There is a better than even chance that if Gertrude is a mouse, or John discarded the apple, then Fred went to the garden.
hypothesis: It is unlikely that either Fred went to the garden, or Lily is a lion.
valid_hypothesis: It is unlikely that either Fred went to the garden, or Lily is a lion.
invalid_hypothesis: It is likely that either Fred went to the garden, or Lily is a lion.
hypothesis_assertion: Either Fred went to the garden, or Lily is a lion.