Anchor: A small group of people are at a rollerskating rink.
Entailed: A group of people are together around a big rink.
Contradiction: A group of people are at a theater watching a movie.
Contradiction: Three people climbing up a steep mountain.
Contradiction: Your garden is bigger than my property. 
Contradiction: The boy is wearing orange swim trunks.
Contradiction: Marginal cost does not reflect the total cost of each pollutant.