context: It is probably the case that Mary discarded the apple. It is certain that Fred moved to the office. We believe that Greg is a swan.
hypothesis: We doubt that fred moved to the office, and Greg is a swan.
valid_hypothesis: We believe that fred moved to the office, and Greg is a swan.
invalid_hypothesis: We doubt that fred moved to the office, and Greg is a swan.
hypothesis_assertion: Fred moved to the office, and Greg is a swan.