docs: def __do_case_6_work(d_w, d_u, case_1, case_2, case_3, dfs_data):
      """Encapsulates the work that will be done for case 6 of __embed_frond,
      since it gets used in more than one place."""
      # --We should only ever see u-cases 1 and 3
      if case_2:
          # --We should never get here
          return False
  
      comp_d_w = abs(d_w)
  
      # --Add the frond to the right side
      __insert_frond_RF(d_w, d_u, dfs_data)
  
      # --Add uw to Rm
      m = dfs_data['FG']['m']
      Rm = R(m, dfs_data)
      if comp_d_w < Rm['x']:
          Rm['x'] = d_w
      if d_u > Rm['y']:
          Rm['y'] = d_u
  
      # --Case 3 requires a bit of extra work
      if case_3:
          Rm['x'] = d_w
          u_m1 = u(m-1, dfs_data)
          while comp_d_w < u_m1:
              merge_Fm(dfs_data)
              m = dfs_data['FG']['m']
              u_m1 = u(m-1, dfs_data)
      #else:
          #print "Case 6 work, u-case 1"
  
      return True