$ perl pdl-rand-mce2.pl | wc -l
52428800

$ perl pdl-rand-mce2.pl | cksum
1425016579 3932160000
$ perl pdl-rand-mce2.pl | cksum
1425016579 3932160000
$ perl pdl-rand-mce2.pl | cksum
1425016579 3932160000

$ perl pdl-rand-mce2.pl | LC_ALL=C sort -u | wc -l
$ perl pdl-rand-mce2.pl | LC_ALL=C mcesort -j16 -u | wc -l
$ perl pdl-rand-mce2.pl | LC_ALL=C parsort --parallel=16 -u | wc -l
52428799