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