{HEAD ~ the waist} is centered at an axial distance from the front end of {TAIL ~ the tip}; and 
{ HEAD ~ the waist } is centered at an axial distance from the front end of { TAIL ~ the tip } ; and
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH