Anchor: A man wearing protective gear riding a dirt bike up a rocky hill.
Entailed: A man rides his bike.
Contradiction: A man walks up a rocky hill.
Contradiction: There is a boy playing in the forest.
Contradiction: The lab is dedicated to medicine and features exhibits to look at.
Contradiction: The committee had its final deliberations last winter. 
Contradiction: The whipmaster tried to stab Ca'daan.