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We calculate the formation energy of these alloys in various crystal symmetries, which include, the (face-centered) cubic $C1_{b}$ ($F\\bar{4}$3m), orthorhombic ($Pnma$), as well as hexagonal ($P\\bar{6}2m$ and $P6_{3}/mmc$) structures. 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We calculate the formation energy of these alloys in various crystal symmetries, which include, the (face-centered) cubic $C1_{b}$ ($F\\bar{4}$3m), orthorhombic ($Pnma$), as well as hexagonal ($P\\bar{6}2m$ and $P6_{3}/mmc$) structures. 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