Keywords: mkulu sulfure coke, otsika sulfure coke, kukhathamiritsa mtengo, sulfure zili Logic: pali kusiyana kwakukulu pakati pa mtengo wapakhomo wa mkulu ndi otsika sulfure mafuta coke, ndipo mtengo kusinthidwa ndi kusintha index si ofanana mulingo, ndi kukweza kuchuluka kwa sulfure m'chinthucho, ...
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