In alternative, {HEAD ~ such code} can be interpreted by {TAIL ~ the CUI} 18 as a new microinstruction 
interpreted by
In alternative , { HEAD ~ such code } can be interpreted by { TAIL ~ the CUI } 18 as a new microinstruction
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH