A program is generated that invokes each peripheral function and each execution function in an order determined from {HEAD ~ the interconnections} between {TAIL ~ the blocks} 
between
A program is generated that invokes each peripheral function and each execution function in an order determined from { HEAD ~ the interconnections } between { TAIL ~ the blocks }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL