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~~Dear Mr. Brown,

We are hoping you will have time to deal with yx problems.

Recognizing your very busy schedule, I’m sending you this note to reply our letters.

I’m sending you this note as a reminder to send us the filled excel sheet.

Enclosed is the actual(newest) excel sheet.

 Would you please to answer our question about the Z problem issue?

We are hoping you will have time to deal with xy problems.

 I’m sincerely looking forward to receiving your reply. Thank you  in advanced!

Best regards,

Gábor Róta