A method 1, characterized in that the pattern of openings in {HEAD ~ the planar element} is obtained by stamping the openings in {TAIL ~ the planar element} 
A method 1 , characterized in that the pattern of openings in { HEAD ~ the planar element } is obtained by stamping the openings in { TAIL ~ the planar element }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL