[{'role': 'user', 'content': "Analyze the following clause from a privacy policy and determine if it's fair or unfair. Also identify any privacy practices mentioned: Opt-Out Procedure. You may opt out of this agreement to arbitrate. If you do so, neither we nor you can require the other to participate in an arbitration proceeding. To opt out, you must notify us in writing postmarked within 30 days of the later of: (i) the date that you first accepted our Terms; and (ii) the date you became subject to this arbitration provision. You must use this address to opt-out: WhatsApp Inc."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]