Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
the terms of sale are incorporated into and made a part of these terms . 

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