$$27-[18-\{16-(5-4-1)\}]$$
$25$
$$27-\left(18-\left(16-\left(1-1\right)\right)\right)$$
$$27-\left(18-\left(16-0\right)\right)$$
$$27-\left(18-16\right)$$
$$27-2$$
$$25$$
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$5^{2}$