overlapping the sheets to be fastened together in a generally parallel relationship to form an overlap region having a first side and a second side, one sheet of {HEAD ~ the plurality} of sheets being thicker than the other of the plurality of {TAIL ~ sheets} 
overlapping the sheets to be fastened together in a generally parallel relationship to form an overlap region having a first side and a second side , one sheet of { HEAD ~ the plurality } of sheets being thicker than the other of the plurality of { TAIL ~ sheets }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL