code: def get_usrgos_g_hdrgos(self, hdrgos):
          
          usrgos_all = set()
          if isinstance(hdrgos, str):
              hdrgos = [hdrgos]
          for hdrgo in hdrgos:
              usrgos_cur = self.hdrgo2usrgos.get(hdrgo, None)
              if usrgos_cur is not None:
                  usrgos_all |= usrgos_cur
              if hdrgo in self.hdrgo_is_usrgo:
                  usrgos_all.add(hdrgo)
          return usrgos_all
docs: Return usrgos under provided hdrgos.