Anchor: A tunnel about halfway along provides chilly relief on a hot day.
Entailed: There is a tunnel you can go in.
Contradiction: You aren't allowed in the tunnel.
Contradiction: Two boys are running the Olympics.
Contradiction: Pigeons seem to be chased and are also chasing people.
Contradiction: Only a few people live in Calcutta and Mumbai. 
Contradiction: The first tier at the Gothic Palazzo Pubblico is over two hundred fifty feet high.