$$(13\div13\ of\ 13+13)/(13\div13\times13+13)$$
$\frac{fo+1}{2}$
$$\frac{1of\times 13+13}{\frac{13}{13}\times 13+13}$$
$$\frac{1of\times 13+13}{1\times 13+13}$$
$$\frac{13of+13}{1\times 13+13}$$
$$\frac{13of+13}{13+13}$$
$$\frac{13of+13}{26}$$
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