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$ perl -Mstrict -Mwarnings -E ' use constant { FIRST => 0, SECOND => 1, THIRD => 2 }; ... A:C:1 A:D:2 A:D:1
$a->[LAST_NAME] cmp $b->[LAST_NAME] || $a->[FIRST_NAME] cmp $b->[FIRST +_NAME]