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<xml>
<w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 4"/>
<w:View>Normal </w:View>
<w:Zoom>0 </w:Zoom>
<w:SaveIfXMLInvalid>false </w:SaveIfXMLInvalid>
a;ldisfjas;dkfjas;kfjas;klfja;lkfja;sdfjas;dkfjaskfjas;dkfjas;dfjasd;lkfjasd;lkjf
<m:smallFrac m:val="off"/>   
<m:dispDef/>
<m:lMargin m:val="0"/>
</xml>

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sed 's/ <[^>]*>//g'

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cat test.txt | sed '/ <[\/]\{0,1\}xml>/!s/.*//' > tmp.xml

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cat test.txt | sed '/ <[\/]\{0,1\}xml>/!s/.*//' > tmp.xml

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vim --> :v/xml/d              ÊÇÕÒµ½·Çpattern,ɾ֮
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