Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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all notices given by you or required under this agreement shall be faxed to linden lab legal department at : (415) 243-9045 ; or mailed to us at : linden lab legal department , 945 battery street , san francisco , ca 94111 . 

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. OPTIONS: ["Contract by using", "Limitation of liability", "Content removal", "Unilateral change", "Unilateral termination", "Choice of law", "Jurisdiction", "None", "Arbitration"].