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Ny varavarankelin’ny afo vy dia manana hery ambony sy fanoherana ny afo tsara. Ny akora mahatohitra afo feno ao anatin’ny varavarana vy mahatohitra afo sy ny raviny dia sariaka ny tontolo iainana ary tsy misy loto. Ny fizotran’ny fitsaboana amin’ny ravina varavarana dia famafazana vovoka na PVC coating, izay dingana fiarovana ny tontolo iainana matotra.

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