The multilayer circuit board has contact areas at {HEAD ~ positions} corresponding to the openings in {TAIL ~ the insulating board} 
The multilayer circuit board has contact areas at { HEAD ~ positions } corresponding to the openings in { TAIL ~ the insulating board }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL