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For an A$-$B binary eutectic alloy, please draw the phase diagram for the system with the following informations: $T^{B_m}>T^{A}m,-$phase is enriched with A element and $-$phase is enriched with $B$ element. Please draw the diagrams to indicate the effects of temperature on the free energy of mixing and the activity of the A$-$B system for the following temperatures respectively. $(1).T^{A_m}>T>T_E,(2).T_E>T.(8$ points$)$