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18 Operation and maintenance %D8%AF%D9%84%D9%8A%D9%84 %D8%A7%D9%84%D8%AA%D8%B4%D8%BA%D9%8A%D9%84 %D9%88%D8%A7%D9%84%D8%B5%D9%8A%D8%A7%D9%86%D9%87 %D9%84%D9%84%D9%85%D8%A8%D8%A7%D9%86%D9%8A