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use strict;
use warnings;
...
# for ( 0 .. 255 ) {
#    printf "%c : %u\n", $_, $seen->[$_] if $seen->[$_];
# }

use strict;
use warnings;
...
# for ( 0 .. 255 ) {
#    printf "%c : %u\n", $_, $seen->[$_] if $seen->[$_];
# }