/usr/share/doc/libmono-i18n-rare4.0-cil/changelog.Debian.gz is in libmono-i18n-rare4.0-cil 4.6.2.7+dfsg-1ubuntu1.
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It is a symlink to /usr/share/doc/libmono-i18n-rare4.0-cil/../libmono-corlib4.5-cil/changelog.Debian.gz