/usr/share/doc/libghc-lambdabot-reference-plugins-prof/changelog.Debian.gz is in libghc-lambdabot-reference-plugins-prof 5.1.0.1-1build4.
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It is a symlink to /usr/share/doc/libghc-lambdabot-reference-plugins-prof/../libghc-lambdabot-reference-plugins-dev/changelog.Debian.gz