$$5-4-(5-(6+4-8)+(3+1+4))$$
$-10$
$$1-\left(5-\left(6+4-8\right)+3+1+4\right)$$
$$1-\left(5-\left(10-8\right)+3+1+4\right)$$
$$1-\left(5-2+3+1+4\right)$$
$$1-\left(3+3+1+4\right)$$
$$1-\left(6+1+4\right)$$
$$1-\left(7+4\right)$$
$$1-11$$
$$-10$$
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