Anchor: The river plays a central role in all visits to Paris.
Entailed: The river is central to all vacations to Paris.
Contradiction: The river has no role to play for all Paris visits.
Contradiction: The rivers don't play a very central role to tourists of Paris.
Contradiction: My office present allowance is totally there.
Contradiction: A man is working on a motor.
Contradiction: A child is rolling down the hill.