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Please do not write below the line

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312 points dcminter | 1 comments | 21 Oct 24 18:42 UTC | HN request time: 0.495s | source
1. urbandw311er ◴[21 Oct 24 21:30 UTC] No.41908707[source]▶
My guess is that undelivered letters are returned to the sender and scanned in. Below the line will be a barcode or similar UID that identifies where the returned letters came from.