$$\left. \begin{array} { l } { \frac { 4 } { 5 } } \\ { \frac { 4 } { 5 } } \end{array} \right.$$
$\frac{4}{5},\frac{4}{5}$
$$\frac{4}{5},\frac{4}{5}$$
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$\frac{4}{5},\ \frac{4}{5}$
