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