Given a text, write a compressed version of it in a single sentence.
One example: Except for this small vocal minority, we have just not gotten a lot of groundswell against this from members, " says APA president Philip G. Zimbardo of Stanford University.
Solution is here: "Except for this small vocal minority, we have not gotten a lot of groundswell against this," says APA president Zimbardo.
Explanation: Both texts convey the same meaning that they have not gotten much groundswell against this except for small minority.

Now, solve this: The Postal Service has an additional disadvantage because city carriers deliver only addressed advertising mail. This requires the mailer to have an address list kept in delivery sequence and to have address labels for each piece.
Solution:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
The Postal Service is disadvantaged where carriers deliver only addressed ads. This requires mailers to have address lists and labels in delivery sequence for each piece.