Anchor: But in 1982, it was taken for granted that the manufacturer of the computer also designed the operating system.
Entailed: The manufacturer of the computer that also designed the OS was taken for granted in 1982. 
Contradiction: The manufacturer of the computer and OS designer was never taken for granted. 
Contradiction: The band played next to the canopy.
Contradiction: The heavyset woman is walking outside.
Contradiction: A man in scuba gear is swimming toward the ocean floor to test his ability.
Contradiction: A woman has a hammer.