$$\left. \begin{array} { l } { 19 + 8 \div 2 - 2 \times 1 + 5 2 \div 5 } \\ { 12 } \end{array} \right.$$
$12,\frac{157}{5}$
$$sort(19+4-2\times 1+\frac{52}{5},12)$$
$$sort(23-2\times 1+\frac{52}{5},12)$$
$$sort(23-2+\frac{52}{5},12)$$
$$sort(21+\frac{52}{5},12)$$
$$sort(\frac{105}{5}+\frac{52}{5},12)$$
$$sort(\frac{105+52}{5},12)$$
$$sort(\frac{157}{5},12)$$
$$\frac{157}{5},12$$
$$\frac{157}{5}$$
$$12,\frac{157}{5}$$
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$\frac{157}{5},\ 12$
