Habka ugu muhiimsan ee wax soo saarka ee tuubada cadaadiska sare: kululaynta billet, tuubo dalool, fidinta tuubada. Wareegidda tuubooyinka cadaadiska-sare, cabbirka iyo dhimista, dhamaystirka iyo qaboojinta tuubada ama habka wax-soo-saarka waxaa la odhan karaa Billet kuleyliyaha daloolinta kulaylka xidhidhyo qajaar qabow soo jiiday kaarboon gubtay cutti ...
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