Man pages matching name dup in section 2:

dup.2.de	debian 10 / manpages-de-dev
dup.2.en	debian 10 / manpages-dev
dup.2.es	debian 10 / manpages-es
dup.2.ja	debian 10 / manpages-ja-dev
dup.2.pl	debian 10 / manpages-pl-dev
dup.2.pt	debian 10 / manpages-pt-dev
dup.2.de	debian 11 / manpages-de-dev
dup.2.en	debian 11 / manpages-dev
dup.2.fr	debian 11 / manpages-fr-dev
dup.2.ja	debian 11 / manpages-ja-dev
dup.2.pt	debian 11 / manpages-pt-dev
dup.2.de	debian 12 / manpages-de-dev
dup.2.en	debian 12 / manpages-dev
dup.2.fr	debian 12 / manpages-fr-dev
dup.2.ja	debian 12 / manpages-ja-dev
dup.2.nl	debian 12 / manpages-nl-dev