context: It is probably not the case that Mary went to the office. It is probably the case that Winona is a wolf. Chances are about even that Greg is a rhino. It is improbable that if Winona is a wolf, and Greg is a rhino, then Lily is green. We doubt that if Greg is a rhino, or Mary went to the office, then Sandra got the milk. It is improbable that if Mary went to the office, and Greg is a rhino, then Bernhard is a frog.
hypothesis: It is almost certain that greg is a rhino, or Bernhard is a frog.
valid_hypothesis: Chances are about even that greg is a rhino, or Bernhard is a frog.
invalid_hypothesis: It is almost certain that greg is a rhino, or Bernhard is a frog.
hypothesis_assertion: Greg is a rhino, or Bernhard is a frog.