Anchor: Other rulers followed suit and by 2526 b.c. the design had been perfected and the world was graced by the Great Pyramid at Giza built for Khufu (or Cheops).
Entailed: The Great Pyramid of Giza was built for Khufu.
Contradiction: The Great Pyramid of Giza was built for Tut.
Contradiction: the cars are not involved in an accident
Contradiction: It could have either been vengeance or mercy. 
Contradiction: Definitely not.
Contradiction: There is a plane in the air.