code: def _has_sorted_sa_indices(s_indices, a_indices):
      L = len(s_indices)
      for i in range(L-1):
          if s_indices[i] > s_indices[i+1]:
              return False
          if s_indices[i] == s_indices[i+1]:
              if a_indices[i] >= a_indices[i+1]:
                  return False
      return True