Unless otherwise expressly stated, the following terms, for the purpose of this chapter, shall be interpreted as follows:
A. Words used in the present tense include the future tense; the singular number includes the plural, and the plural number includes the singular; words of masculine gender include the feminine gender, and words of feminine gender include the masculine gender.
B. The words "includes" or "including" shall not limit a term to the specific example but are intended to extend its meaning to all other instances of like kind and character.
C. The words "shall" and "must" are mandatory; the words "may" and "should" are permissive.
D. The words "used or occupied" include the words "intended, designed, maintained or arranged to be used or occupied."