context: It is probably not the case that Winona is a mouse. There is a better than even chance that Greg is a swan. It is probably the case that Brian is yellow. It is likely that if Brian is yellow, or Winona is a mouse, then Mary went to the office. It is likely that if Brian is yellow, or Winona is a mouse, then Bernhard is a lion. It is probably the case that if Winona is a mouse, or Greg is a swan, then John picked up the milk.
hypothesis: Chances are about even that greg is a swan, and Brian is yellow.
valid_hypothesis: Chances are about even that greg is a swan, and Brian is yellow.
invalid_hypothesis: It is impossible that greg is a swan, and Brian is yellow.
hypothesis_assertion: Greg is a swan, and Brian is yellow.