context: It is unlikely that Brian is a frog. It is almost certain that John picked up the apple. There is a very good chance that Greg is yellow. We doubt that if Greg is yellow, and John picked up the apple, then Bill went to the garden. There is a better than even chance that if Greg is yellow, and Brian is a frog, then Mary moved to the office. There is little chance that if Brian is a frog, and John picked up the apple, then Sandra grabbed the milk.
hypothesis: There is little chance that either Mary moved to the office, or Brian is a frog.
valid_hypothesis: There is little chance that either Mary moved to the office, or Brian is a frog.
invalid_hypothesis: We believe that either Mary moved to the office, or Brian is a frog.
hypothesis_assertion: Either Mary moved to the office, or Brian is a frog.