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I really don't know how to     this problem, it's too difficult.

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how to do    what to do it    how to do it    which to do it  
that; that    how; that    what; that    how; that  
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how to do it   how to do  w  
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steadily    originally    apparently    permanently  
what to do   how to do    to do what    how can I do  
steadily    originally    apparently    permanently  
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