Edit the US Code

Hi all,

I downloaded some copies of US Code. Since I am only interested in the
statute, not revision history and other information, I'd like to
delete anything enclosed by a pair of '-SOURCE-' and '-End-'. How can
I do it in vim? Thanks.

Example text:

-CITE-
21 USC Sec. 321a
01/07/2011

-EXPCITE-
TITLE 21 - FOOD AND DRUGS
CHAPTER 9 - FEDERAL FOOD, DRUG, AND COSMETIC ACT
SUBCHAPTER II - DEFINITIONS

-HEAD-
Sec. 321a. "Butter" defined

-STATUTE-
For the purposes of the Food and Drug Act of June 30, 1906
(Thirty-fourth Statutes at Large, page 768) "butter" shall be
understood to mean the food product usually known as butter, and
which is made exclusively from milk or cream, or both, with or
without common salt, and with or without additional coloring
matter, and containing not less than 80 per centum by weight of
milk fat, all tolerances having been allowed for.

-SOURCE-
(Mar. 4, 1923, ch. 268, 42 Stat. 1500.)

-REFTEXT-
REFERENCES IN TEXT
The Food and Drug Act of June 30, 1906, referred to in text, is
act June 30, 1906, ch. 3915, 34 Stat. 768, which was classified to
subchapter I (Sec. 1 et seq.) of chapter 1 of this title, was
repealed (except for section 14a which was transferred to section
376 of this title) by act June 25, 1938, ch. 675, Sec. 1002(a),
formerly Sec. 902(a), 52 Stat. 1059; renumbered Sec. 1002(a), Pub.
L. 111-31, div. A, title I, Sec. 101(b)(2), June 22, 2009, 123
Stat. 1784, and is covered by this chapter.

-COD-
CODIFICATION
Section, which was not enacted as part of the Federal Food,
Drug,
and Cosmetic Act which comprises this chapter, was formerly
classified to section 6 of this title. Section 1002(a) of act June
25, 1938, set out as an Effective Date note under section 301 of
this title, provided that this section should remain in force and
effect and be applicable to the provisions of this chapter.

-End-

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