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Starling carefully opens the letter she has just received from Hannibal Lecter.
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The Las Vegas postmark, no doubt placed on the envelope by a re-mailing service, is meant to appeal to Starling's 'trashy' side - it is designed to suggest that Lecter wants to have a 'quickie wedding' with her.
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Later, while Starling is listening to a recorded tape of her interview of Lecter in Memphis, Tennessee,[a] she experiences a sudden urge to smell the letter. This use of her sensation function shows that she is becoming more like Lecter in terms of psychological functions - Lecter's goal is to 'modify' her as required and then unite with her.
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a. Starling's interview of Lecter in Memphis, is shown in The Silence of the Lambs, the Lecter movie that was released prior to Hannibal, in 1991.