context: It is almost certain that Bernhard is a frog. Chances are slight that Winona is a cat. Chances are slight that John picked up the apple. It is highly unlikely that if Winona is a cat, and Bernhard is a frog, then Gertrude is a mouse. It is improbable that if Winona is a cat, and Bernhard is a frog, then Mary went to the garden. We believe that if John picked up the apple, and Winona is a cat, then Greg is yellow.
hypothesis: It is impossible that gertrude is a mouse, and Greg is yellow.
valid_hypothesis: It is impossible that gertrude is a mouse, and Greg is yellow.
invalid_hypothesis: There is a very good chance that gertrude is a mouse, and Greg is yellow.
hypothesis_assertion: Gertrude is a mouse, and Greg is yellow.