Thus, in {HEAD ~ a rod and connector kit} having {TAIL ~ rods} in a progression of lengths, L1, L2 . . . Ln, from L1 to Ln  
having
Thus , in { HEAD ~ a rod and connector kit } having { TAIL ~ rods } in a progression of lengths , L1 , L2 . . . Ln , from L1 to Ln
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH