Anchor: These immigrant voyages were breathtaking and treacherous, requiring the crossing of 2,500 miles (4,000 km) of open seas aboard dugout catamarans and outrigger canoes.
Entailed: The immigrand voyages required the crossing of many miles of open seas.
Contradiction: The immigrand voyages required the crossing of very short distances.
Contradiction: A man is walking up stairs.
Contradiction: Humans sitting
Contradiction: They eat pants
Contradiction: The game is intellectually demanding.