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