2 files changed, 48 insertions, 0 deletions
diff --git a/challenge-220/deadmarshal/perl/ch-1.pl b/challenge-220/deadmarshal/perl/ch-1.pl
new file mode 100644
index 0000000000..505ecbcb8f
--- /dev/null
+++ b/challenge-220/deadmarshal/perl/ch-1.pl
@@ -0,0 +1,14 @@
+#!/usr/bin/env perl
+use strict;
+use warnings;
+use List::MoreUtils qw(uniq);
+
+sub common_characters{
+  my %count;
+  map{$count{$_}++ foreach uniq split '',CORE::fc} @{$_[0]};
+  sort grep{$count{$_} == @{$_[0]}} keys %count;
+}
+
+printf "%s\n", join ' ', common_characters(["Perl","Rust","Raku"]);
+printf "%s\n", join ' ', common_characters(["love","live","leave"]);
+
diff --git a/challenge-220/deadmarshal/perl/ch-2.pl b/challenge-220/deadmarshal/perl/ch-2.pl
new file mode 100644
index 0000000000..3de51a3fcf
--- /dev/null
+++ b/challenge-220/deadmarshal/perl/ch-2.pl
@@ -0,0 +1,34 @@
+#!/usr/bin/env perl
+use strict;
+use warnings;
+use Algorithm::Combinatorics qw(permutations);
+use List::MoreUtils qw(slide all);
+use Data::Show;
+
+sub is_perfect_square{
+  do{
+    my $sqrt = sqrt($_[0]);
+    return ($sqrt * $sqrt) == $_[0];
+  }if($_[0] >= 0);
+  0
+}
+
+sub squareful{
+  my %hash;
+  map{$hash{$_}++} @{$_[0]};
+  return @{$_[0]} if keys %hash == 1;
+  my @ret;
+  my $iter = permutations($_[0]);
+  while(my $p = $iter->next)
+  {
+    if(all{$_ == 1} slide{is_perfect_square($a+$b)} @$p)
+    {
+      push @ret,$p;
+    }
+  }
+  @ret;
+}
+
+print show squareful([1,17,8]);
+print show squareful([2,2,2]);
+