Anchor: Proposed  vertical flight only, to a maximum of 20 feet above the ground.
Entailed: The maximum altitude for the flight is 20 feet above the ground.
Contradiction: The proposed vertical flight is said to reach heights of 50 feet above the ground.
Contradiction: A woman just finished eating cake.
Contradiction: It's a big mystery.
Contradiction: Two children are laughing and playing in the field.
Contradiction: A counter has different kinds of meat.