https://math.stackexchange.com/questions/5036590/does-have-a-refund-policy

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https://support.google.com/business/thread/325786976?hl=tr&sjid=11331117082189496683-NC

https://support.google.com/edu/classroom/thread/325784398?hl=en&sjid=6158815838699761006-NA

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https://superuser.com/questions/1880669/getfaqsrefunddoes-american-airline-reimburse-for-cancelled-flight

https://support.google.com/business/thread/325780444?hl=tr&sjid=5845269000241870228-NC

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https://support.google.com/edu/classroom/thread/325778163?hl=en&sjid=1127460115204030893-NA