Given Sentence 1 and Sentence 2, indicate your answer as yes when the two sentences clearly agree or clearly disagree with each other. If the relationship cannot be determined, answer with 'no'.

A man walks by a building at night. <sep> A man is in the city.
no

Men wearing hats walk on the street. <sep> The men are walking inside the school.
yes

A choir of youths are singing. <sep> they are singing in a christmas program

no