context: It is certain that Greg is white. It is probable that John moved to the office. Chances are slight that Mary dropped the milk.
hypothesis: It is likely that mary dropped the milk, and Greg is white.
valid_hypothesis: It is improbable that mary dropped the milk, and Greg is white.
invalid_hypothesis: It is likely that mary dropped the milk, and Greg is white.
hypothesis_assertion: Mary dropped the milk, and Greg is white.