Anchor: Outside, the grounds cover some 80 hectares (200 acres).
Entailed: The grounds cover many acres.
Contradiction: The ground are just an acre.
Contradiction: A group of children are playing video games in the living room.
Contradiction: Some kids are playing soccer.
Contradiction: The person is teaching inside the math classroom.
Contradiction: A computer that guesses tennis wins was wrong about Agassi winning Winbledon.