Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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please note that if you purchase a subscription through the apple itunes store or our iphone application , the sale is final , and we will not provide a refund . 

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