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5 4 b11
6 3 b2
....



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<item id='1' text='a'>
<item id='2' text='a1'></item>
</item>
<item id='3' text='b'>
<item id='4' text='b1'>
<item id='5' text='b11'></item>
</item>
<item id='6' text='b2'></item>
</item>
....




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