Section 3622. Separability

If any clause, sentence, paragraph, subdivision,
  section  or  part  of  this  article  shall  be adjudged by any court of
  competent jurisdiction to be invalid, the  judgment  shall  not  affect,
  impair,  or  invalidate  the remainder thereof, but shall be confined in
  its operation to the clause, sentence, paragraph,  subdivision,  section
  or  part  thereof  directly  involved  in  the  controversy in which the
  judgment shall have been rendered.