 
 <translate> Napkin can avoid a watermark by a cup. Cup may cause watermark if a napkin is not used under it. So the final answer is water mark. <hau> Napkin zai iya kauce wa alamar ruwa ta kofin. Kofin na iya haifar da alamar ruwa idan ba a yi amfani da napkin a ƙarƙashinsa ba. Don haka amsar karshe ita ce alamar ruwa. 