Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
some content may contain `` r-rated '' material , nudity , profanity , and mature subject matter . 

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