Anchor: A hiker uses metal walking sticks to hike up a snowy mountain.
Entailed: Someone is hiking up a mountain.
Contradiction: A hiker uses metal walking sticks to hike up a snowy mountain on the face of the Moon.
Contradiction: The riot officers are fast asleep in their own beds.
Contradiction: He saw the people were concerned.
Contradiction: The Chinese were worried for good reason!
Contradiction: There are at least 3 people.