context: There is a better than even chance that John is in the office. It is probably the case that Brian is green. We believe that Bernhard is a swan.
hypothesis: It is impossible that brian is green, and John is in the office.
valid_hypothesis: Chances are about even that brian is green, and John is in the office.
invalid_hypothesis: It is impossible that brian is green, and John is in the office.
hypothesis_assertion: Brian is green, and John is in the office.