1.F.3.  Limited right of replacement or refund — If you discover a defect in this electronic work within 90 days of receiving it, you can receive a refund of the money (if any) you paid for it by sending a written explanation to the person you received the work from.  If you received the work on a physical medium, you must return the medium with your written explanation.  The person or entity that provided you with the defective work may elect to provide a replacement copy in lieu of a refund.  If you received the work electronically, the person or entity providing it to you may choose to give you a second opportunity to receive the work electronically in lieu of a refund.  If the second copy is also defective, you may demand a refund in writing without further opportunities to fix the problem...