The device 6, wherein {HEAD ~ the vertical projection} comprises {TAIL ~ a stem} and a top portion, and wherein the stem is slimmer than the top portion 
The device 6 , wherein { HEAD ~ the vertical projection } comprises { TAIL ~ a stem } and a top portion , and wherein the stem is slimmer than the top portion
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH