Ana ratsa bututun ƙarfe marasa ƙarfi daga dukan ƙarfen zagaye, kuma bututun ƙarfe marasa walda a saman ana kiran bututun ƙarfe maras sumul.Dangane da hanyar samarwa, ana iya raba bututun ƙarfe maras kyau zuwa bututun ƙarfe mara nauyi mai zafi, bututun ƙarfe mara ƙarfi, bututun ƙarfe mai sanyi, kabu mai sanyi ...
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