START      H    *-3
           MLC  FOO,BAR
           MRCM FOOBAR,201
FOO        DC   @FOO@,G
BAR        DC   @BAR@
 FOOBAR    DC   @FOOBAR@,G
THUD       DCW  1
           DCW  +FOO
           DCW  +FOO+1
           DCW  +FOO+X1
           DCW  -FOO
           DCW  -FOO+1
           END  START