Text: All the ground floor windows were shuttered tight, but upstairs, on the first floor (it was a two-storied house) I noticed a window with a light burning and the curtains not drawn.
Entailment: A solitary window on the first floor of the two story house glowed with a light burning and undrawn curtains, even though the ground floor windows were all shuttered tight.
Contradiction: Every window of the two-story house was gleaming brightly with the many lamps lit inside.