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    my $retn = $alpha_a cmp $alpha_b;
    return $retn if $retn != 0;
...
    return $retn if $retn != 0;
    
    return $num2_a <=> $num2_b;

return $alpha_a cmp $alpha_b
      || $num1_a <=> $num1_b
      || $num2_a <=> $num2_b;