Anchor: A fisherman fishes at the bank of a foggy river.
Entailed: The humidity is high near the river.
Contradiction: A fisherman stands by a clear river on a bright sunny day.
Contradiction: The ambient temperature of the river is at absolute zero.
Contradiction: The man is hunting moose.
Contradiction: The fisherman swims in the river.
Contradiction: The fisherman is hunting deer with a rifle.