Anchor: In giving content to the presence requirement, it is important to distinguish between the unrestricted categories of aliens and H-2A workers.
Entailed: The H-2A workers and aliens do not belong to the same categories.
Contradiction: There's no difference between H-2A and aliens so it's not important to distinguish between them.
Contradiction: Children are running in the school yard.
Contradiction: They are correct. 
Contradiction: A complete picture is not needed to see what is going on in the instance.
Contradiction: A leader in printing in publish has been Edinburgh.