SECTION XIII-l. INDEXING.
   (a)    System Used. The indexing system of this Charter shall be as follows: Articles numbered I, II, III, IV, etc.; sections numbered l, 2, 3, etc.; subsections lettered (a), (b), (c), etc.
   (b)    Severability. Any word, phrase, clause, sentence, subsection, section, or article of this Charter may be amended as, or in, the manner hereinafter provided.