a following second section disposed cooperatively adjacent said first section, {HEAD ~ said second section} having {TAIL ~ a leading downwardly beveled end} cooperating in surface contact with the rearward end bevel of said first section 
having
a following second section disposed cooperatively adjacent said first section , { HEAD ~ said second section } having { TAIL ~ a leading downwardly beveled end } cooperating in surface contact with the rearward end bevel of said first section
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH