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