I'm playing with Data::PowerSet. It creates all subsets of a list of elements. Starting with a set @a = 'A' .. 'E', I want to keep a subset @b of @a if and only if the elements of @b are adjacent in @a. In the example below, I want to keep the values marked with stars only. Is there a module like List::Util or List::MoreUtils that can help? 
use strict;
use warnings;

my @a = 'A' .. 'E';
use Data::PowerSet 'powerset';
my $sets = powerset({ min => 3 }, @a);

foreach my $b (@$sets) {
  print join('', @{$b});
}
__END__
ABCDE *
BCDE  *
ACDE
CDE   *
ABDE
BDE
ADE
ABCE
BCE
ACE
ABE
ABCD  *
BCD   *
ACD
ABD
ABC   *

[download]
In this example the elements of @a are single letters, but I see no reason why they can't be multi-letter strings.
--
No matter how great and destructive your problems may seem now, remember, you've probably only seen the tip of them. [1]

In reply to Subsets and adjacent values by andreas1234567

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