From Step: 132, control may proceed to {HEAD ~ Step}: 102 in {TAIL ~ a closed loop manner} 
From Step : 132 , control may proceed to { HEAD ~ Step } : 102 in { TAIL ~ a closed loop manner }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL