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