{HEAD ~ The matrix arrangement} is embodied, for example, symmetrical in {TAIL ~ reference} to a horizontal and vertical 0° axis 
is embodied symmetrical in
{ HEAD ~ The matrix arrangement } is embodied , for example , symmetrical in { TAIL ~ reference } to a horizontal and vertical 0 ° axis
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH