premise: A person with a striped tube standing in the middle of a crowd of people. hypothesis: A human is surrounded.
entailment: A person is surrounded by a crowd.|entailment: To be surrounded and to be in a crowd of people are the same thing.|entailment: The person is in the "middle of a crowd of people" which means he is a human, and another word for being "in the middle of a crowd" is being surrounded.