193.2009—Rules of regulatory construction.
(a)
As used in this part:
(1)
Includes means including but not limited to;
(2)
May means is permitted to or is authorized to;
(3)
May not means is not permitted to or is not authorized to; and
(4)
Shall or must is used in the mandatory and imperative sense.
(1)
Words importing the singular include the plural; and
(2)
Words importing the plural include the singular.