CFR /  Title 49  /  Part 192  /  Sec. 192.15 Rules of regulatory construction.

(a) As used in this part:

Includes means including but not limited to.

May means ``is permitted to'' or ``is authorized to''.

May not means ``is not permitted to'' or ``is not authorized to''.

Shall is used in the mandatory and imperative sense.

(b) In this part:

(1) Words importing the singular include the plural;

(2) Words importing the plural include the singular; and

(3) Words importing the masculine gender include the feminine.