[Code of Federal Regulations] [Title 40, Volume 21] [Revised as of July 1, 2003] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR164.1] [Page 166] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) Subpart A--General Sec. 164.1 Number of words. As used in this part, a word in the singular form shall be deemed to import the plural, and vice versa, as the case may require.