premise: A woman talking on a cellphone and a man with a mustache emerge up the stairs from an underground subway. hypothesis: A man and woman are exiting a subway.
entailment: A 'Man and woman' is a simpler rephrasing of 'A woman talking on a...' and 'a man with a mustache', also the fact they are emerging up the stairs from an underground subway infers that they are 'exiting' the subway.