Question
$2-[3-\{6-(5-\overline{4-3})\}]$
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Answer
$\begin{aligned} & 2-[3-\{6-(5-\overline{4-3})\}] \\ & \Rightarrow 2-[3-\{6-(5-1)\}] \\ & \Rightarrow 2-[3-\{6-4\}] \\ & \Rightarrow 2-(3-2) \\ & \Rightarrow 2-1=1\end{aligned}$
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