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 the plurality of sheets being thicker than the other of {HEAD ~ 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 the plurality of sheets being thicker than the other of { HEAD ~ 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL