Very generic extension IMO, registered a few LLL's so far...
CNC.GDN
CND.GDN
CNF.GDN
CNG.GDN
CNH.GDN
CNJ.GDN
CNK.GDN
CNL.GDN
CNM.GDN
CNQ.GDN
CNR.GDN
CNS.GDN
CNT.GDN
CNW.GDN
CNX.GDN
CNY.GDN
DDG.GDN
DFG.GDN
DGN.GDN
DNG.GDN
DNH.GDN
DPR.GDN
DRM.GDN
DSH.GDN
DSX.GDN
DXS.GDN
RKS.GDN
RLH.GDN
RRK.GDN...