Anchor: Therefore, in some cases contractors must find manpower on very short notice.
Entailed: Some contractors need to find manpower on short notice. 
Contradiction: The contractors do not need to hire manpower on short notice. 
Contradiction: Mrs. Inglethorp's husband never took her after-dinner coffee.
Contradiction: There is a man outside.
Contradiction: I can solve this larger issue now with a simple solution.
Contradiction: A man is standing on a paved walkway.