$$(6-4)+3-18+31-(+4+10)=$$
$4$
$$2+3-18+31-\left(4+10\right)$$
$$5-18+31-\left(4+10\right)$$
$$-13+31-\left(4+10\right)$$
$$18-\left(4+10\right)$$
$$18-14$$
$$4$$
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$2^{2}$