context: We doubt that Sandra took the football. We believe that Greg is a frog. It is improbable that Winona is a mouse. There is little chance that if Greg is a frog, and Sandra took the football, then John moved to the office. It is certain that if Greg is a frog, and Winona is a mouse, then Bernhard is a lion. It is certain that if Winona is a mouse, or Greg is a frog, then Jeff went to the garden.
hypothesis: It is probable that either Greg is a frog, or Winona is a mouse.
valid_hypothesis: It is probable that either Greg is a frog, or Winona is a mouse.
invalid_hypothesis: Chances are slight that either Greg is a frog, or Winona is a mouse.
hypothesis_assertion: Either Greg is a frog, or Winona is a mouse.