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    @hexStr = ("339E84CBCF3C7", "2739E84CBCF3C", ...);
    
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    my @sortedIdx = keysort { $hexStr[$_] } (0..$#hexStr);
    
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    my @sortedIdx = skeysort { $hexStr[$_] } (0..$#hexStr);  # line 58
    
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    Argument "273D09979E78F" isn't numeric in array element at sortHexIndi
    +ces.pl line 58.
    Use of uninitialized value in subroutine entry at sortHexIndices.pl li
    +ne 58.
    ...
    Use of uninitialized value in subroutine entry at sortHexIndices.pl li
    +ne 58.
    Argument "33CE73D09979E" isn't numeric in array element at sortHexIndi
    +ces.pl line 58.
    Argument "39E739E84CBCF" isn't numeric in array element at sortHexIndi
    +ces.pl line 58.