Thus, {HEAD ~ the recess} 26 of the container 12B confronts {TAIL ~ the recess} 26 of the container 12C, and these two recesses 26 form a vertically elongated, substantially hexagonal through hole which penetrates in the horizontal direction, as shown in FIGS 3 and 4 
Thus , { HEAD ~ the recess } 26 of the container 12B confronts { TAIL ~ the recess } 26 of the container 12C , and these two recesses 26 form a vertically elongated , substantially hexagonal through hole which penetrates in the horizontal direction , as shown in FIGS 3 and 4
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH