context: Chances are slight that Mary got the milk. It is impossible that Greg is green. We believe that Bill went to the garden.
hypothesis: It is almost certain that greg is green, and Bill went to the garden.
valid_hypothesis: It is impossible that greg is green, and Bill went to the garden.
invalid_hypothesis: It is almost certain that greg is green, and Bill went to the garden.
hypothesis_assertion: Greg is green, and Bill went to the garden.