Anchor: a plausible increase in the penetration of computer ownership by households over the course of a single year.
Entailed: Computer ownership by households usually increases in a year.
Contradiction: Households do not own any computers and that will never change.
Contradiction: The man sits on the ground in his backyard.
Contradiction: There are ruined dormitories on the excavation site.  
Contradiction: The young boy was sad in his loss.
Contradiction: Girls by a tree.