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use Sort::Key::Maker iikeysort => qw(integer integer); @sorted = iikeysort { /^(\d+)x(\d+)$/ } @a;
use Sort::Key::Multi 'iikeysort'; @sorted = iikeysort { /^(\d+)x(\d+)$/ } @a;
use Sort::Key::Multi 'isikeysort'; @sorted = isikeysort { /^(\d+)(\w+)(\d+)$/ } @a;
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