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$ perl -T -MDate::Manip::DM6 -E 'say $Date::Manip::VERSION'

$ DATE_MANIP=DM5 perl -T -MDate::Manip -E 'say $Date::Manip::VERSION'

$ DATE_MANIP=DM6 perl -T -MDate::Manip -E 'say $Date::Manip::VERSION'