Please refer to FIG 2, {HEAD ~ the main body} 1 is {TAIL ~ a rectangular block shape} and defines two opposite lateral surfaces 10 and a top surface 11 contiguous to the two lateral surfaces 10 
is
Please refer to FIG 2 , { HEAD ~ the main body } 1 is { TAIL ~ a rectangular block shape } and defines two opposite lateral surfaces 10 and a top surface 11 contiguous to the two lateral surfaces 10
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL 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