xxx \(x\xxx \xxxx{xxxx}(x,x)\). xxxxxxxx \(x\) x.x.x. xxxxx \(x_x,\xxxx,x_x\) xxx xxxxxx xxx xxxxxxx \(x_x=\xxx\{x_x,\xxxx,x_x\}\).
xxxx xx \(\xxxxxx{x}[x_x]\)? xx x xxxxx xxxxx, xxxx xxxx xxxx xxxxxxx xxxx xxxx \(x=x\)?
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