It will be appreciated that the term sheet is used herein in a broad sense and is not limited to planar shapes or to shapes not exceeding a certain thickness or to {HEAD ~ shapes} of {TAIL ~ constant thickness} 
of
It will be appreciated that the term sheet is used herein in a broad sense and is not limited to planar shapes or to shapes not exceeding a certain thickness or to { HEAD ~ shapes } of { TAIL ~ constant thickness }
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 REL TAIL TAIL TAIL TAIL TAIL TAIL