Text: Back in the 1950s, twin colossi sat astride the Hudson, figuratively glowering at each  Betty Friedan in Grandview on the West Bank, writing The Feminine Mystique , and John Cheever in Scarborough on the East Bank, writing the Wapshot books and the short stories.
Entailment: In the 1950s two famous authors lived near the Hudson river.
Contradiction: Two famous authors lived on the same side of the Hudson river.