Assertion: arsenal's supporter | /r/HasProperty | the regulation
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Source sentences:
text: The away supporter configuration can be expanded from 1,500 seats to 4,500 seats behind the south goal in the lower tier, and a further 4,500 seats can be made available also in the upper tier, bringing the total to 9,000 supporters (the regulation 15% required for domestic cup competitions such as the FA Cup and EFL Cup).