$$\frac{ 6 }{ 1 } - \frac{ 5 }{ 1 } + \frac{ 4 }{ 1 } + \frac{ 3 }{ 1 }$$
$8$
$$6-\frac{5}{1}+\frac{4}{1}+\frac{3}{1}$$
$$6-5+\frac{4}{1}+\frac{3}{1}$$
$$1+\frac{4}{1}+\frac{3}{1}$$
$$1+4+\frac{3}{1}$$
$$5+\frac{3}{1}$$
$$5+3$$
$$8$$
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$2^{3}$