Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
we encourage you to review the terms from time to time to ensure that you understand the terms and conditions that apply to your access to , and use of , the services . 

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