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