Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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after the goods have been delivered to you , you have the right , within 30 days from the date of your receipt of the goods , to cancel our contract with you and return the goods . 

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