Anchor: A swimmer takes a breath between strokes as she heads for opposite side of the pool.
Entailed: person swimming
Contradiction: boy sleeps in tent
Contradiction: When I arrived, I witnessed rabbits and rainbows.
Contradiction: The United States of America makes up over fifteen percent of global GDP. 
Contradiction: Two motorcycles sit in the corner of a shop.
Contradiction: The students get their pictures taken.