Man pages matching name math::cartesian::product in section 3pm:

Math::Cartesian::Product.3pm.en	debian 10 / libmath-cartesian-product-perl
Math::Cartesian::Product.3pm.en	debian 11 / libmath-cartesian-product-perl
Math::Cartesian::Product.3pm.en	debian 12 / libmath-cartesian-product-perl