Anchor: They practiced a slash-and-burn agriculture of yams and millet, a technique that exhausted the soil and imposed a semi-nomadic existence from one jungle clearing to another.
Entailed: Slash and burn agriculture was practiced for yams and millet where a partially nomadic existence occurred from one jungle clearing to another.
Contradiction: They used traditional farming techniques not involving the slash and burn of their predecessors.
Contradiction: The owner organizations never acquired any buildings, right?
Contradiction: Several people singing on a stage.
Contradiction: A group of cheerleaders riding in a bus.
Contradiction: Tuppence was taken by the arm by him.