$$(-8)-(-28)-(-13)-(-31)$$
$64$
$$-8+28-\left(-13\right)-\left(-31\right)$$
$$20-\left(-13\right)-\left(-31\right)$$
$$20+13-\left(-31\right)$$
$$33-\left(-31\right)$$
$$33+31$$
$$64$$
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$2^{6}$