Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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in such event you will not be entitled to a pro-rata refund or credit . 

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