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