§ 151.007 RULES.
   (A)   Words used in the present tense include the past and future tense; the singular number includes the plural and the plural includes the singular; the word “shall” is mandatory and the words “should” and “may” are permissive.
   (B)   In the event of conflicting provisions in the test of these regulations, the more restrictive shall apply.
(`86 Code, § 10.08)