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