Anchor: Date and explicit provenance must be provided.
Entailed: The date and explicit provenance are important information in this particular situation. 
Contradiction: The date and provenance are not important and there is no need to provide this information. 
Contradiction: Our estimate makes no assumption as to the proportion of different crop varieties.
Contradiction: Being caught would not change anything.
Contradiction: A little boy is trying to swing higher.
Contradiction: The man is outside.