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  2. World of Warcraft: Wrath of the Lich King - Wikipedia

    en.wikipedia.org/wiki/World_of_Warcraft:_Wrath...

    On October 15, 2008, Patch 3.0.2, titled 'Wrath of the Lich King', was released to pave the way for the upcoming expansion, bringing many of the expansion's updated systems to the game pre-release. [19] Several new features were added including an all new class called the Death Knight. Classes received new spells and abilities.

  3. Civil defense siren - Wikipedia

    en.wikipedia.org/wiki/Civil_defense_siren

    The air raid warning comes in 3 types: [21] Pre-raid warning: a 36-second high-tone followed by a 24-second low-tone, with three cycles per period. This warning signifies an air raid is likely about to take place. Raid warning: a 6-second high-tone followed by a 6-second low tone, with 15 cycles per period. This signifies that an air raid is ...