context: It is improbable that Greg is a lion. Chances are about even that Brian is a swan. It is certain that Mary moved to the garden.
hypothesis: Chances are about even that mary moved to the garden, and Brian is a swan.
valid_hypothesis: Chances are about even that mary moved to the garden, and Brian is a swan.
invalid_hypothesis: It is impossible that mary moved to the garden, and Brian is a swan.
hypothesis_assertion: Mary moved to the garden, and Brian is a swan.