context: It is certain that Sandra left the apple. We believe that Bernhard is green. It is probable that Yann is tired. There is almost no chance that if either Sandra left the apple, or Bernhard is green, then Fred dropped the apple. It is unlikely that if either Yann is tired, or Sandra left the apple, then John went to the office. Chances are slight that if either Yann is tired, or Sandra left the apple, then Brian is a rhino.
hypothesis: We believe that sandra left the apple, and Fred dropped the apple.
valid_hypothesis: It is impossible that sandra left the apple, and Fred dropped the apple.
invalid_hypothesis: We believe that sandra left the apple, and Fred dropped the apple.
hypothesis_assertion: Sandra left the apple, and Fred dropped the apple.