Anchor: People playing tug-of-war in the sand.
Entailed: They are playing in the sand.
Contradiction: People are playing basketball in the ocean.
Contradiction: A group of 4 men are arm wrestling.
Contradiction: People are hanging out on the river bank.
Contradiction: One man walking in the direction of the woods.
Contradiction: For three billion years, the only life-forms on Earth were single-celled organisms.