卖方提价可在每个季度的第一天进行，但至少应提前十五（15）天以书面提交或邮寄通知买方。
Seller may increase any price hereunder on the first day of any calendar quarter-yearly period by delivering or mailing written notice to Buyer at least fifteen (15) days prior to such day.
我们的信是同一天发的，因此在邮寄中错过。
We posted our letters on the same day so they crossed in the post.
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