From mboxrd@z Thu Jan  1 00:00:00 1970
From: Adam Porter <adam@alphapapa.net>
Subject: Re: How to capture export prepended header numbering
Date: Mon, 30 Dec 2019 18:43:53 -0600
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FYI, I tidied the code a tiny bit and posted it here:

https://github.com/alphapapa/unpackaged.el#outline-number-overlays