Anchor: Workmen are working in a stairwell.
Entailed: There is a stair area with people working.
Contradiction: There is an empty street.
Contradiction: solo pianist playing
Contradiction: the wheels in his brain were turning. 
Contradiction: He will categorically deny having completed the specified action.
Contradiction: If we spent some time every week or part of our salary or maybe forced kids to serve us maybe.