The body has a recessed portion and a plurality of {TAIL ~ protrusion portions} disposed beside the recessed portion, wherein the protrusion portions protrude from {HEAD ~ the recessed portion} 
The body has a recessed portion and a plurality of { TAIL ~ protrusion portions } disposed beside the recessed portion , wherein the protrusion portions protrude from { HEAD ~ the recessed portion }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD