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$AFile = "c:\test\a.txt"
$DFile = "c:\test\add.txt"
$Hash = @{}
Get-Content $AFile | %{
	if(!$Hash.ContainsKey($_)){
		$_
	 	$Hash.Add($_ , 1)
	}
} | Out-File $DFile

$Hash.Keys

CMD /C "PAUSE"
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