.
                             ICBM
                          ICBMICB
                         MICBMICB
                         MICBMICB
                           MICBMIC
                           BMICBM
                           ICBMICB
                           MICBMI
                           CBMICB
                           MICBMI
                           ICBMICB
                           MICBMI
                ICBM               ICBM
         ICBMICBM      ICBMICBM
        ICBMICBMIC  BMICBMIXBM
          ICBMICBM       ICBMICBM
              ICBM                  ICBM