$$8 - [ 18 - \{ 16 - ( 5 - 4 - 1 ) \} ]$$
$6$
$$8-\left(18-\left(16-\left(1-1\right)\right)\right)$$
$$8-\left(18-\left(16-0\right)\right)$$
$$8-\left(18-16\right)$$
$$8-2$$
$$6$$
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$2\times 3$
