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      "I think I am quite sure of it." 
     "My dear Manette, if he were overworked now--" 
     "My dear Lorry, I doubt if that could easily be.  There has been a violent stress in one direction, and it needs a counterweight."  
     "Excuse me, as a persistent man of business.  Assuming for a moment, that he was overworked; it would show itself in some renewal of this disorder?" 
 
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      "I do not think so.  I do not think," said Doctor Manette with the firmness of self-conviction, "that anything but the one train of association would renew it.  I think that, henceforth, nothing but some extraordinary jarring of that chord could renew it.  After what has happened, and after his recovery, I find it difficult to imagine any such violent sounding of that string again.  I trust, and I almost believe, that the circumstances likely to renew it are exhausted." 
 
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