{HEAD ~ The outside angle} 15 of {TAIL ~ the base} 10 forming a junction with the oblique side 12 remains rounded 
of
{ HEAD ~ The outside angle } 15 of { TAIL ~ the base } 10 forming a junction with the oblique side 12 remains rounded
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH