Anchor: And the one important clue they overlooked."
Entailed: And the singular important clue, was the one they overlooked.
Contradiction: They were always aware of the most important clue. 
Contradiction: A bus drives up the street.
Contradiction: A man standing on an icy street with a building next to him outside.
Contradiction: The boy swims in the ocean.
Contradiction: A girl is waiting for a plane to land.