Anchor: There was the sound of typewriters from behind the doors, and the floor was covered with composition tile, instead of the too-lush carpets.
Entailed: The sound of typewriters came from behind the door.
Contradiction: No sound came from behind the doors.
Contradiction: He was unable to see anything.
Contradiction: There were no signals of despair that had been satisfied covertly. 
Contradiction: Compatibility is not required from hardware or software.
Contradiction: The woman has wet hair.