{HEAD ~ The body} 1310 has a recessed portion 1312 and {TAIL ~ a plurality} of protrusion portions 1314 disposed beside the recessed portion 1312, and the protrusion portions 1314 protrude from the recessed portion 1312 
{ HEAD ~ The body } 1310 has a recessed portion 1312 and { TAIL ~ a plurality } of protrusion portions 1314 disposed beside the recessed portion 1312 , and the protrusion portions 1314 protrude from the recessed portion 1312
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH