context: It is improbable that Sandra got the apple. It is unlikely that John discarded the milk. It is impossible that Jeff moved to the office. Chances are about even that if either Jeff moved to the office, or John discarded the milk, then Fred went to the cinema. It is probably not the case that if either John discarded the milk, or Jeff moved to the office, then Brian is white. It is likely that if either Sandra got the apple, or John discarded the milk, then Greg is a swan.
hypothesis: It is impossible that jeff moved to the office, and Brian is white.
valid_hypothesis: It is impossible that jeff moved to the office, and Brian is white.
invalid_hypothesis: It is likely that jeff moved to the office, and Brian is white.
hypothesis_assertion: Jeff moved to the office, and Brian is white.