Question:
And what, exactly, is the line between stalking and not stalking, anyway?

Does it follow that "How can stalking and not stalking be differentiated? "?
Answer:
yes

Question:
How they had grown.

Does it follow that "The did not grow at all. "?
Answer:
no

Question:
Neither the appropriations act nor the Corporation's regulations defines the term present in the United States.

Does it follow that "Both the appropriations act and the Corporation's regulations define the term present in the United States."?
Answer:
no

Question:
Unless Wanamaker was willing to pay double for reaching the right half of the people, his total ad spending would go down and not up.

Does it follow that "Wanamaker has a long list of ads that he wants to put out."?
Answer:
it is not possible to tell