Both these angles are substantially the same as {TAIL ~ the corresponding angles} of {HEAD ~ the conventional boot structure} 
Both these angles are substantially the same as { TAIL ~ the corresponding angles } of { HEAD ~ the conventional boot structure }
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD