$$\left. \begin{array} { l } { \frac { 2 } { 3 } - \frac { 3 } { 2 } } \\ { \quad 5 - 1 } \end{array} \right.$$
$-\frac{5}{6},\ 4$
$$sort(\frac{4}{6}-\frac{9}{6},5-1)$$
$$sort(\frac{4-9}{6},5-1)$$
$$sort(-\frac{5}{6},5-1)$$
$$sort(-\frac{5}{6},4)$$
$$-\frac{5}{6},4$$
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