92 Ill. Adm. Code 456.30
Standards of Construction
Section 456
Section 456.30 Standards of
Construction
a) "Shall" and "must" are used in the
imperative sense. "May" allows permissiveness under terms specified
in the standards. "Will" indicates intention, promise or
willingness.
b) Words imparting the masculine gender include the feminine.
c) Singular includes plural.