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