$$10 - [ 20 \div \{ 20 - 5 ( 4 - 1 ) \} ]$$
$6$
$$10-\frac{20}{20-5\times 3}$$
$$10-\frac{20}{20-15}$$
$$10-\frac{20}{5}$$
$$10-4$$
$$6$$
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$2\times 3$
