$$\left. \begin{array} { l } { \frac { 1 } { 2 } + \frac { 2 } { 4 } } \\ { \frac { 1 } { 4 } + 5 } \end{array} \right.$$
$1,\ \frac{21}{4}$
$$sort(\frac{1}{2}+\frac{1}{2},\frac{1}{4}+5)$$
$$sort(\frac{1+1}{2},\frac{1}{4}+5)$$
$$sort(\frac{2}{2},\frac{1}{4}+5)$$
$$sort(1,\frac{1}{4}+5)$$
$$sort(1,\frac{1}{4}+\frac{20}{4})$$
$$sort(1,\frac{1+20}{4})$$
$$sort(1,\frac{21}{4})$$
$$1,\frac{21}{4}$$
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