code: def p_levelsigs(self, p):
          'levelsigs : levelsigs SENS_OR levelsig'
          p[0] = p[1] + (p[3],)
          p.set_lineno(0, p.lineno(1)f p_levelsigs(self, p):
          'levelsigs : levelsigs SENS_OR levelsig'
          p[0] = p[1] + (p[3],)
          p.set_lineno(0, p.lineno(1))
docs: levelsigs : levelsigs SENS_OR levelsig