context: We believe that John dropped the apple. It is improbable that Mary put down the milk. Chances are slight that Bernhard is a swan. It is probably not the case that if Mary put down the milk, and John dropped the apple, then Brian is a lion. It is probably not the case that if Mary put down the milk, or Bernhard is a swan, then Emily is a mouse. Chances are about even that if either John dropped the apple, or Mary put down the milk, then Greg is white.
hypothesis: It is probably not the case that either Emily is a mouse, or Greg is white.
valid_hypothesis: It is probably not the case that either Emily is a mouse, or Greg is white.
invalid_hypothesis: It is almost certain that either Emily is a mouse, or Greg is white.
hypothesis_assertion: Either Emily is a mouse, or Greg is white.