context: It is probably not the case that Mary discarded the milk. We doubt that Lily is yellow. It is impossible that Bill is in the park.
hypothesis: It is certain that either Bill is in the park, or Lily is yellow.
valid_hypothesis: We doubt that either Bill is in the park, or Lily is yellow.
invalid_hypothesis: It is certain that either Bill is in the park, or Lily is yellow.
hypothesis_assertion: Either Bill is in the park, or Lily is yellow.