9 files changed, 245 insertions, 0 deletions
diff --git a/challenge-160/arne-sommer/blog.txt b/challenge-160/arne-sommer/blog.txt
new file mode 100644
index 0000000000..8302cb1a16
--- /dev/null
+++ b/challenge-160/arne-sommer/blog.txt
@@ -0,0 +1 @@
+https://raku-musings.com/magic-equilibrium.html
diff --git a/challenge-160/arne-sommer/perl/ch-1.raku b/challenge-160/arne-sommer/perl/ch-1.raku
new file mode 100755
index 0000000000..558cb651a2
--- /dev/null
+++ b/challenge-160/arne-sommer/perl/ch-1.raku
@@ -0,0 +1,36 @@
+#! /usr/bin/env perl
+
+use strict;
+use warnings;
+use feature 'say';
+
+my $n = $ARGV[0] || "";
+
+die "Values 1..9 only" unless $n =~ /^[1-9]$/;
+
+my @names =
+(
+  "zero",
+  "one",
+  "two",
+  "three",
+  "four",
+  "five",
+  "six",
+  "seven",
+  "eight",
+  "nine"
+);
+
+my @result;
+
+do
+{
+  my $text   = $names[$n];
+  my $length = length($text);
+
+  push(@result, "$text is $names[$length]");
+  $n = $length;
+} while $n != 4;
+
+say ucfirst(join(", ", @result)) . ", four is magic.";
diff --git a/challenge-160/arne-sommer/perl/ch-2.raku b/challenge-160/arne-sommer/perl/ch-2.raku
new file mode 100755
index 0000000000..64d91b2888
--- /dev/null
+++ b/challenge-160/arne-sommer/perl/ch-2.raku
@@ -0,0 +1,34 @@
+#! /usr/bin/env perl
+
+use strict;
+use warnings;
+use feature 'say';
+use List::Util 'sum';
+use Getopt::Long;
+use Perl6::Junction 'all';
+
+my $verbose =  0;
+
+GetOptions("verbose" => \$verbose);
+
+my @n = @ARGV;
+
+die "Positive integers only" unless @n && all(@n) == qr/^\d+$/;
+
+my $elems = @n;
+
+for my $equilibrium (1 .. $elems -2) 
+{
+  my @first  = @n[0 .. $equilibrium -1];
+  my @second = @n[$equilibrium +1 .. $elems -1];
+
+  say ": @first :: @second" if $verbose;
+
+  if (sum(@first) == sum(@second))
+  {
+    say $equilibrium;
+    exit;
+  }
+}
+
+say -1;
diff --git a/challenge-160/arne-sommer/perl/equilibrium-index-perl b/challenge-160/arne-sommer/perl/equilibrium-index-perl
new file mode 100755
index 0000000000..64d91b2888
--- /dev/null
+++ b/challenge-160/arne-sommer/perl/equilibrium-index-perl
@@ -0,0 +1,34 @@
+#! /usr/bin/env perl
+
+use strict;
+use warnings;
+use feature 'say';
+use List::Util 'sum';
+use Getopt::Long;
+use Perl6::Junction 'all';
+
+my $verbose =  0;
+
+GetOptions("verbose" => \$verbose);
+
+my @n = @ARGV;
+
+die "Positive integers only" unless @n && all(@n) == qr/^\d+$/;
+
+my $elems = @n;
+
+for my $equilibrium (1 .. $elems -2) 
+{
+  my @first  = @n[0 .. $equilibrium -1];
+  my @second = @n[$equilibrium +1 .. $elems -1];
+
+  say ": @first :: @second" if $verbose;
+
+  if (sum(@first) == sum(@second))
+  {
+    say $equilibrium;
+    exit;
+  }
+}
+
+say -1;
diff --git a/challenge-160/arne-sommer/perl/four-is-magic-perl b/challenge-160/arne-sommer/perl/four-is-magic-perl
new file mode 100755
index 0000000000..558cb651a2
--- /dev/null
+++ b/challenge-160/arne-sommer/perl/four-is-magic-perl
@@ -0,0 +1,36 @@
+#! /usr/bin/env perl
+
+use strict;
+use warnings;
+use feature 'say';
+
+my $n = $ARGV[0] || "";
+
+die "Values 1..9 only" unless $n =~ /^[1-9]$/;
+
+my @names =
+(
+  "zero",
+  "one",
+  "two",
+  "three",
+  "four",
+  "five",
+  "six",
+  "seven",
+  "eight",
+  "nine"
+);
+
+my @result;
+
+do
+{
+  my $text   = $names[$n];
+  my $length = length($text);
+
+  push(@result, "$text is $names[$length]");
+  $n = $length;
+} while $n != 4;
+
+say ucfirst(join(", ", @result)) . ", four is magic.";
diff --git a/challenge-160/arne-sommer/raku/ch-1.raku b/challenge-160/arne-sommer/raku/ch-1.raku
new file mode 100755
index 0000000000..955aa14cf6
--- /dev/null
+++ b/challenge-160/arne-sommer/raku/ch-1.raku
@@ -0,0 +1,30 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (Int $n is copy where 0 < $n < 10);
+
+my @names =
+[
+  "zero",
+  "one",
+  "two",
+  "three",
+  "four",
+  "five",
+  "six",
+  "seven",
+  "eight",
+  "nine"
+];
+
+my @result;
+
+repeat
+{
+  my $text   = @names[$n];
+  my $length = $text.chars;
+
+  @result.push: "$text is @names[$length]";
+  $n = $length;
+} while $n != 4;
+
+say tc(@result.join(", ")) ~ ", four is magic.";
+\ No newline at end of file
diff --git a/challenge-160/arne-sommer/raku/ch-2.raku b/challenge-160/arne-sommer/raku/ch-2.raku
new file mode 100755
index 0000000000..5e38c42636
--- /dev/null
+++ b/challenge-160/arne-sommer/raku/ch-2.raku
@@ -0,0 +1,22 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (*@n where @n.elems > 0 && all(@n) ~~ /^\d+$/, :v(:$verbose));
+
+my $elems = @n.elems;
+
+for 1 .. $elems - 2 -> $equilibrium
+{
+  my @first  = @n[0 .. $equilibrium -1];
+  my @second = @n[$equilibrium +1 .. $elems -1];
+
+  say ": @first[] :: @second[]" if $verbose;
+
+  if @first.sum == @second.sum
+  {
+    say $equilibrium;
+    exit;
+  }
+}
+
+say -1;
+
diff --git a/challenge-160/arne-sommer/raku/equilibrium-index b/challenge-160/arne-sommer/raku/equilibrium-index
new file mode 100755
index 0000000000..5e38c42636
--- /dev/null
+++ b/challenge-160/arne-sommer/raku/equilibrium-index
@@ -0,0 +1,22 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (*@n where @n.elems > 0 && all(@n) ~~ /^\d+$/, :v(:$verbose));
+
+my $elems = @n.elems;
+
+for 1 .. $elems - 2 -> $equilibrium
+{
+  my @first  = @n[0 .. $equilibrium -1];
+  my @second = @n[$equilibrium +1 .. $elems -1];
+
+  say ": @first[] :: @second[]" if $verbose;
+
+  if @first.sum == @second.sum
+  {
+    say $equilibrium;
+    exit;
+  }
+}
+
+say -1;
+
diff --git a/challenge-160/arne-sommer/raku/four-is-magic b/challenge-160/arne-sommer/raku/four-is-magic
new file mode 100755
index 0000000000..955aa14cf6
--- /dev/null
+++ b/challenge-160/arne-sommer/raku/four-is-magic
@@ -0,0 +1,30 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (Int $n is copy where 0 < $n < 10);
+
+my @names =
+[
+  "zero",
+  "one",
+  "two",
+  "three",
+  "four",
+  "five",
+  "six",
+  "seven",
+  "eight",
+  "nine"
+];
+
+my @result;
+
+repeat
+{
+  my $text   = @names[$n];
+  my $length = $text.chars;
+
+  @result.push: "$text is @names[$length]";
+  $n = $length;
+} while $n != 4;
+
+say tc(@result.join(", ")) ~ ", four is magic.";
+\ No newline at end of file