context: It is probably the case that Brian is white. It is unlikely that Mary went to the garden. It is almost certain that Fred is in the park.
hypothesis: There is little chance that fred is in the park, or Brian is white.
valid_hypothesis: It is certain that fred is in the park, or Brian is white.
invalid_hypothesis: There is little chance that fred is in the park, or Brian is white.
hypothesis_assertion: Fred is in the park, or Brian is white.