$ mkdir Markov
$ cd Markov/
$ touch Ndimensional.pm
$ gedit Ndimensional.pm &
[1] 20524
$ pwd
/home/bob/2.scripts/pages/7.cw/template_stuff/crosswords/eugene/Markov
[1]+  Done                    gedit Ndimensional.pm
^^^^ pasted in source
$ cd ..
$ ls
1.bliako.pl  bliako1.pm  Markov
$ ./1.bliako.pl 
Can't locate Markov/Ndimensional.pm in @INC (you may need to install the Markov::Ndimensional module) (@INC contains: Markov /home/bob/perl5/lib/perl5/x86_64-linux-gnu-thread-multi /home/bob/perl5/lib/perl5 /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.26.1 /usr/local/share/perl/5.26.1 /usr/lib/x86_64-linux-gnu/perl5/5.26 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.26 /usr/share/perl/5.26 /usr/local/lib/site_perl /usr/lib/x86_64-linux-gnu/perl-base) at ./1.bliako.pl line 13.
BEGIN failed--compilation aborted at ./1.bliako.pl line 13.
$