context: Chances are slight that Brian is a swan. Chances are about even that Bernhard is a frog. There is almost no chance that John discarded the apple. There is little chance that if John discarded the apple, or Bernhard is a frog, then Greg is yellow. There is a better than even chance that if either John discarded the apple, or Brian is a swan, then Julius is a lion. Chances are about even that if John discarded the apple, and Brian is a swan, then Jeff moved to the office.
hypothesis: It is impossible that jeff moved to the office, and Greg is yellow.
valid_hypothesis: It is impossible that jeff moved to the office, and Greg is yellow.
invalid_hypothesis: It is probably the case that jeff moved to the office, and Greg is yellow.
hypothesis_assertion: Jeff moved to the office, and Greg is yellow.