sentences:  Montenegro declared its independence from Serbia and Montenegro on 3 June 2006, after a majority of Montenegrins supported independence in a national referendum.As a part of that country, constituently, Montenegro had unofficially been using the .cg.yu second-level domain; Montenegrin Authorities used .mn.yu subdomain, while the .cs top-level domain (TLD) had been assigned to Serbia and Montenegro in 2003 following the breakup of Yugoslavia, but remained unused.Montenegro was assigned the ISO 3166-1 two-letter code "ME", which was allocated by the International Organization for Standardization (ISO) in September 2006 (most other possible abbreviations of Montenegro (MO, MN, MT, MG and MR) and its Montenegrin name Crna Gora (CG) having already been taken).