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