Anchor: Several men are sitting by a river conversing with one another while a boat drifts by them.
Entailed: Several men are sitting by a river.
Contradiction: Several men are driving in a truck on a road.
Contradiction: Two men were asleep by the river.
Contradiction: The dogs are chasing a black cat.
Contradiction: The men are canoeing on the river today
Contradiction: Women are watching the tugboat.