#!/usr/bin/perl -l

# http://perlmonks.org/?node_id=1198509

use strict;
use warnings;

my @elements = (0, 2, 3);

my ($first, $last) = @elements[0, -1];
my %next;
@next{@elements} = @elements[1 .. @elements];

for my $count (1,2,3,4,7,8)
  {
  print "count=$count";

  $_ = $first x $count;

  1 while print(join ',', /./g),
    s/([^$last])($last*)$/ $next{$1} x length $& /e;
  }