context: We doubt that John put down the milk. It is probable that Bernhard is a frog. It is highly unlikely that Fred is in the park. It is almost certain that if John put down the milk, or Bernhard is a frog, then Brian is a rhino. Chances are slight that if Fred is in the park, or Bernhard is a frog, then Julius is green. Chances are about even that if John put down the milk, or Fred is in the park, then Greg is green.
hypothesis: It is impossible that greg is green, and Julius is green.
valid_hypothesis: It is impossible that greg is green, and Julius is green.
invalid_hypothesis: It is certain that greg is green, and Julius is green.
hypothesis_assertion: Greg is green, and Julius is green.