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