Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
further , unless you and airbnb both otherwise agree in writing , the arbitrator may not consolidate more than one party 's claims and may not otherwise preside over any form of any class or representative proceeding . 

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