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Energy efficiency improvement of multifamily residential buildings in town of Troyan with addresses: r.c. Lagat, res. bl 12; 2nd Lagat Str., res. bl Mashstroy-2; r.c. Chernogor 16th,18th, 20th Arda, Maritsa, Tundzha; 12th Opalchenska Str., res. bl Balkan