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