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