Anchor: The Accademia's uncontested star, the great David (which once stood in the Piazza della Signoria, now substituted by a life-size copy), provides the perfect object lesson of the finished product, a hero infused with all the contained energy needed to hurl that stone at Goliath.
Entailed: The statue of David once stood at the Accademia, but it has now been replaced by a copy.
Contradiction: In the Piazza della Signoria, the original statue of David still stands where it was first erected.
Contradiction: Clinton has no speaking skills and is doomed to be impeached.
Contradiction: A dog runs.
Contradiction: No we can't
Contradiction: A man is surfing in the ocean against a beautiful beachfront