Portions of the circuits are bonded together and {HEAD ~ electrical connections} between {TAIL ~ the bonded portions} are formed 
between
Portions of the circuits are bonded together and { HEAD ~ electrical connections } between { TAIL ~ the bonded portions } are formed
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH