ref: 2b99422480d596ebc26921c87c6bb81a07949f3e
parent: a351bcdccdf5a4273bc8dc3360a48fbb8b8aa9ea
author: Dave Woodman <dave@naffnet.org.uk>
date: Thu Sep 14 02:46:36 EDT 2023
Tidy artefacts
binary files a/ch2.pdf /dev/null differ
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binary files a/ch9.pdf /dev/null differ