Anchor: The lingua franca of commercial America has done what Esperanto could  achieve universality.
Entailed: What Esperanto could achieve universality, the lingua franca of commercial America has done.
Contradiction: Esperanto could achieve what the lingua franca of commercial America has not.
Contradiction: The three riders are relaxing in the park while others take care of their horses.
Contradiction: I am a proponent of seat belts and airbags.
Contradiction: A man is sitting on a stool
Contradiction: A boy is skating about to flip.