Text: Purists complain that the cubist effect of steep hillsides dotted with square, flat-roofed houses has been spoiled by modern development, but the beaches all around are still pleasant.
Entailment: Modern development has ruined the cubist effect of the hillside and houses according to Purists.
Contradiction: The hillsides remain untouched but, the beaches have become polluted, disgusting, and ruined.