$$2+4-(2-(-3+3)+2-(3-1))-2=$$
$2$
$$6-\left(2-\left(-3+3\right)+2-\left(3-1\right)\right)-2$$
$$6-\left(2-0+2-\left(3-1\right)\right)-2$$
$$6-\left(2+2-\left(3-1\right)\right)-2$$
$$6-\left(4-\left(3-1\right)\right)-2$$
$$6-\left(4-2\right)-2$$
$$6-2-2$$
$$4-2$$
$$2$$
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