Practice $6$ require computer$-$generated drawings. Hand drawings are

not allowed. You can use any software, and please include a detailed

process $($e$.$g$.,$ code or URL$).$

For a subregular solution, $H_{\text{m}\text{i}\text{x}}=x_1{x}_2(a_1{x}_1+a_2{x}_2)$

Please draw the figure of $G$ vs$.x_B$ at the fixed temperature, when

$($a$)a_1>0,a_2>0(6\%)$

$($b

$($c$)a_1>0,a_2=0(6\%)$