premise: A dark-skinned man in white shirts and a black sleeveless shirt flips his skateboard on a cement surface surrounded by tall buildings and palm trees. hypothesis: a man flips his skateboard on a cement surface.
entailment: dark-skinned man flips his skateboard   is the same as man flips his skateboard.|entailment: A man (dark-skinned) flips his skateboard on a cement surface as part of man's description surrounded by tall buildings and palm trees.|entailment: The person is a man because he is a dark-skinned man.