Still referring to FIG 1, block 15 depicts {HEAD ~ the first step} in {TAIL ~ the practice} of this invention 
in
Still referring to FIG 1 , block 15 depicts { HEAD ~ the first step } in { TAIL ~ the practice } of this invention
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH