Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
the application of the united nations convention on contracts for the international sale of goods ( cisg ) is excluded . 

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