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

use MCE::Shared 1.002;

mce_open my $IN, "<:gzip", "wat.paths.gz" or die "open error: $!";
mce_open my $OUT, ">", \*STDOUT or die "open error: $!";