{HEAD ~ The controller} inserts {TAIL ~ a five digit prefix}, namely the access code into the dialed number 
inserts
{ HEAD ~ The controller } inserts { TAIL ~ a five digit prefix } , namely the access code into the dialed number
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH