Anchor: a snowboarder wearing red is descending a snow covered mountain.
Entailed: a snowboarder is outside
Contradiction: the swimmer swam alone
Contradiction: A man is making a sand castle.
Contradiction: SO2 and NOx react to form the fine particles that make up PM2.
Contradiction: A man rode his bike on the farm.
Contradiction: Purity doesn't make for an especially strong column.