{HEAD ~ The use} of the symmetric pin allows {TAIL ~ automatic insertion} of the pin in that the orientation of the pin relative to the board is unimportant 
allows
{ HEAD ~ The use } of the symmetric pin allows { TAIL ~ automatic insertion } of the pin in that the orientation of the pin relative to the board is unimportant
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH