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  1. or download this
    use strict;
use warnings;
...
print(Dumper(unpack('H*', $s)), "\n");

print(Dumper(unpack('H*', "\x{C9}\x{2660}")), "\n");
  2. or download this
    "c9"        # Ok
"c9"        # Ok
Character in 'H' format wrapped in unpack at 750077.pl line 16.
"c960"      # GIGO