Man pages matching name bio::tools::primer::pair in section 3pm:

Bio::Tools::Primer::Pair.3pm.en	debian 10 / libbio-perl-perl
Bio::Tools::Primer::Pair.3pm.en	debian 11 / libbio-perl-perl
Bio::Tools::Primer::Pair.3pm.en	debian 12 / libbio-perl-perl