Anchor: A snowmobile rider flies through the air on his or her machine in front of tall pine trees.
Entailed: The rider is making airtime.
Contradiction: It is summer.
Contradiction: A child makes a snowman.
Contradiction: A snowmobile rider waits patiently for signs of snow in front of pine trees.
Contradiction: There are two riders.
Contradiction: A person is putting oil in their snowmobile.