Anchor: The dogs run in the green field.
Entailed: There is a world that exists in which animals are present.
Contradiction: There are dogs swimming in a lake.
Contradiction: The dog is asleep in the grass.
Contradiction: During Christmas time and summer afternoons, it runs hourly but other times of year it is only on Saturdays.
Contradiction: A man takes a picture of the field.
Contradiction: Men look at vegetation.