- Added solutions by Arne Sommer.

16 files changed, 1020 insertions, 868 deletions

diff --git a/challenge-020/arne-sommer/blog.txt b/challenge-020/arne-sommer/blog.txt
new file mode 100644
index 0000000000..f1e4b2b2cb
--- /dev/null
+++ b/challenge-020/arne-sommer/blog.txt
@@ -0,0 +1 @@
+https://perl6.eu/amicable-split.html
diff --git a/challenge-020/arne-sommer/perl6/ch-1.p6 b/challenge-020/arne-sommer/perl6/ch-1.p6
new file mode 100755
index 0000000000..5e8a9e35f4
--- /dev/null
+++ b/challenge-020/arne-sommer/perl6/ch-1.p6
@@ -0,0 +1,16 @@
+#! /usr/bin/env perl6
+
+grammar SPLIT
+{
+  regex TOP  { <Char>+ }
+  regex Char { (.) $0* }
+}
+
+sub MAIN (Str $string, :$quote = '"')
+{
+  my $result = SPLIT.parse($string);
+
+  $result
+    ?? $result<Char>.map({ $quote ~ $_.Str ~ $quote }).join(", ").say
+    !! print "\n";
+}
diff --git a/challenge-020/arne-sommer/perl6/ch-2.p6 b/challenge-020/arne-sommer/perl6/ch-2.p6
new file mode 100755
index 0000000000..54fe99b3c3
--- /dev/null
+++ b/challenge-020/arne-sommer/perl6/ch-2.p6
@@ -0,0 +1,35 @@
+#! /usr/bin/env perl6
+
+multi proper-divisors (2) { return (1); } 
+
+multi proper-divisors (Int $number where $number > 2) 
+{
+  return (1) if $number.is-prime; 
+
+  my @divisors = (1);
+  for 2 .. ($number -1) -> $candidate 
+  {
+    @divisors.push: $candidate if $number %% $candidate;
+  }
+  return @divisors;
+}
+
+my @sum;
+
+for 2 .. Inf -> $current
+{
+  my $sum = proper-divisors($current).sum;
+  @sum[$current] = $sum;
+
+  next if $sum == 1 || $sum >= $current;
+
+  my $new-sum = @sum[$sum] // next;
+
+  next if $new-sum == 1 || $new-sum >= $current || $sum == $new-sum;
+
+  if $sum == @sum[$new-sum]
+  {
+    say "(@sum[$sum], $sum)";
+    last;
+  }
+}
diff --git a/challenge-020/arne-sommer/perl6/smallest-amiciable-number-cheating b/challenge-020/arne-sommer/perl6/smallest-amiciable-number-cheating
new file mode 100755
index 0000000000..df2534bafd
--- /dev/null
+++ b/challenge-020/arne-sommer/perl6/smallest-amiciable-number-cheating
@@ -0,0 +1,6 @@
+#! /usr/bin/env perl6
+
+say "(220, 284)";
+
+# The challenge said "Write a script to print ..." and not "compute", so I'm good.
+
diff --git a/challenge-020/arne-sommer/perl6/split-change-gather b/challenge-020/arne-sommer/perl6/split-change-gather
new file mode 100755
index 0000000000..269821bb1f
--- /dev/null
+++ b/challenge-020/arne-sommer/perl6/split-change-gather
@@ -0,0 +1,26 @@
+#! /usr/bin/env perl6
+
+sub MAIN (Str $string, :$quote = '"')
+{
+  split-change($string).map({ $quote ~ $_ ~ $quote }).join(", ").say;
+}
+
+sub split-change ($in)
+{
+  gather 
+  {
+    my $out = $in.substr(0,1);
+    for 1 .. $in.chars -> $index
+    {
+      if $out.substr(0,1) eq $in.substr($index,1)
+      {
+        $out ~= $in.substr($index,1);
+      }
+      else
+      {
+        take $out;
+        $out = $in.substr($index,1);
+      }
+    }
+  }
+}
diff --git a/challenge-020/arne-sommer/perl6/split-change-grammar b/challenge-020/arne-sommer/perl6/split-change-grammar
new file mode 100755
index 0000000000..ecc7a6ecdb
--- /dev/null
+++ b/challenge-020/arne-sommer/perl6/split-change-grammar
@@ -0,0 +1,14 @@
+#! /usr/bin/env perl6
+
+grammar SPLIT
+{
+  regex TOP  { <Char>+ }
+  regex Char { (.) $0* }
+}
+
+sub MAIN (Str $string, :$quote = '"')
+{
+  my $result = SPLIT.parse($string);
+
+  $result<Char>.map({ $quote ~ $_.Str ~ $quote }).join(", ").say;
+}
diff --git a/challenge-020/arne-sommer/perl6/split-change-loop b/challenge-020/arne-sommer/perl6/split-change-loop
new file mode 100755
index 0000000000..931a4e94d9
--- /dev/null
+++ b/challenge-020/arne-sommer/perl6/split-change-loop
@@ -0,0 +1,35 @@
+#! /usr/bin/env perl6
+
+sub MAIN (Str $string, :$quote = '"')
+{
+  split-change($string).map({ $quote ~ $_ ~ $quote }).join(", ").say;
+}
+
+sub split-change ($string)
+{
+  my @out;
+  my @in = $string.comb;
+  my $out;
+
+  while @in
+  {
+    $out = @in.shift;
+
+    while @in
+    {
+      if @in[0] eq $out.substr(0,1)
+      {
+        $out ~= @in.shift;
+      }
+      else
+      {
+        @out.push($out); $out = ""; 
+        last;
+      }
+    }
+  }
+
+  @out.push($out) if $out;
+
+  return @out;
+}
diff --git a/stats/pwc-current.json b/stats/pwc-current.json
index 49c8e11eda..2540a10966 100644
--- a/stats/pwc-current.json
+++ b/stats/pwc-current.json
@@ -1,52 +1,32 @@
 {
-   "chart" : {
-      "type" : "column"
-   },
-   "xAxis" : {
-      "type" : "category"
-   },
-   "yAxis" : {
-      "title" : {
-         "text" : "Total Solutions"
-      }
-   },
-   "legend" : {
-      "enabled" : 0
-   },
-   "title" : {
-      "text" : "Perl Weekly Challenge - 020"
-   },
-   "subtitle" : {
-      "text" : "[Champions: 19] Last updated at 2019-08-10 19:51:19 GMT"
-   },
-   "tooltip" : {
-      "pointFormat" : "<span style='color:{point.color}'>{point.name}</span>: <b>{point.y:f}</b><br/>",
-      "headerFormat" : "<span style='font-size:11px'>{series.name}</span><br/>",
-      "followPointer" : 1
-   },
-   "plotOptions" : {
-      "series" : {
-         "borderWidth" : 0,
-         "dataLabels" : {
-            "enabled" : 1,
-            "format" : "{point.y}"
-         }
-      }
-   },
    "drilldown" : {
       "series" : [
          {
-            "id" : "Andrezgz",
+            "name" : "Andrezgz",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
             ],
-            "name" : "Andrezgz"
+            "id" : "Andrezgz"
          },
          {
-            "id" : "Athanasius",
+            "id" : "Arne Sommer",
+            "data" : [
+               [
+                  "Perl 6",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ],
+            "name" : "Arne Sommer"
+         },
+         {
+            "name" : "Athanasius",
             "data" : [
                [
                   "Perl 5",
@@ -57,9 +37,11 @@
                   2
                ]
             ],
-            "name" : "Athanasius"
+            "id" : "Athanasius"
          },
          {
+            "id" : "Dave Jacoby",
+            "name" : "Dave Jacoby",
             "data" : [
                [
                   "Perl 5",
@@ -69,29 +51,27 @@
                   "Blog",
                   1
                ]
-            ],
-            "id" : "Dave Jacoby",
-            "name" : "Dave Jacoby"
+            ]
          },
          {
             "name" : "Duane Powell",
-            "id" : "Duane Powell",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
-            ]
+            ],
+            "id" : "Duane Powell"
          },
          {
+            "name" : "E. Choroba",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
             ],
-            "id" : "E. Choroba",
-            "name" : "E. Choroba"
+            "id" : "E. Choroba"
          },
          {
             "name" : "Feng Chang",
@@ -108,48 +88,48 @@
             "id" : "Feng Chang"
          },
          {
+            "id" : "Gustavo Chaves",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
             ],
-            "id" : "Gustavo Chaves",
             "name" : "Gustavo Chaves"
          },
          {
-            "id" : "Kevin Colyer",
+            "name" : "Kevin Colyer",
             "data" : [
                [
                   "Perl 6",
                   2
                ]
             ],
-            "name" : "Kevin Colyer"
+            "id" : "Kevin Colyer"
          },
          {
-            "name" : "Lubos Kolouch",
+            "id" : "Lubos Kolouch",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
             ],
-            "id" : "Lubos Kolouch"
+            "name" : "Lubos Kolouch"
          },
          {
+            "id" : "Mark Anderson",
+            "name" : "Mark Anderson",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
-            ],
-            "id" : "Mark Anderson",
-            "name" : "Mark Anderson"
+            ]
          },
          {
-            "name" : "Martin Barth",
             "id" : "Martin Barth",
+            "name" : "Martin Barth",
             "data" : [
                [
                   "Perl 6",
@@ -168,37 +148,36 @@
             "id" : "Noud"
          },
          {
+            "id" : "Ozzy",
             "data" : [
                [
                   "Perl 6",
                   1
                ]
             ],
-            "id" : "Ozzy",
             "name" : "Ozzy"
          },
          {
-            "name" : "Pete Houston",
             "id" : "Pete Houston",
             "data" : [
                [
                   "Perl 5",
                   1
                ]
-            ]
+            ],
+            "name" : "Pete Houston"
          },
          {
             "name" : "Randy Lauen",
-            "id" : "Randy Lauen",
             "data" : [
                [
                   "Perl 6",
                   2
                ]
-            ]
+            ],
+            "id" : "Randy Lauen"
          },
          {
-            "id" : "Roger Bell West",
             "data" : [
                [
                   "Perl 5",
@@ -209,11 +188,10 @@
                   2
                ]
             ],
-            "name" : "Roger Bell West"
+            "name" : "Roger Bell West",
+            "id" : "Roger Bell West"
          },
          {
-            "name" : "Ruben Westerberg",
-            "id" : "Ruben Westerberg",
             "data" : [
                [
                   "Perl 5",
@@ -223,11 +201,13 @@
                   "Perl 6",
                   2
                ]
-            ]
+            ],
+            "name" : "Ruben Westerberg",
+            "id" : "Ruben Westerberg"
          },
          {
-            "name" : "Simon Proctor",
             "id" : "Simon Proctor",
+            "name" : "Simon Proctor",
             "data" : [
                [
                   "Perl 6",
@@ -236,20 +216,41 @@
             ]
          },
          {
+            "id" : "Steven Wilson",
             "name" : "Steven Wilson",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
-            ],
-            "id" : "Steven Wilson"
+            ]
          }
       ]
    },
+   "xAxis" : {
+      "type" : "category"
+   },
+   "subtitle" : {
+      "text" : "[Champions: 20] Last updated at 2019-08-10 21:54:51 GMT"
+   },
+   "plotOptions" : {
+      "series" : {
+         "dataLabels" : {
+            "format" : "{point.y}",
+            "enabled" : 1
+         },
+         "borderWidth" : 0
+      }
+   },
+   "tooltip" : {
+      "followPointer" : 1,
+      "headerFormat" : "<span style='font-size:11px'>{series.name}</span><br/>",
+      "pointFormat" : "<span style='color:{point.color}'>{point.name}</span>: <b>{point.y:f}</b><br/>"
+   },
    "series" : [
       {
          "colorByPoint" : 1,
+         "name" : "Perl Weekly Challenge - 020",
          "data" : [
             {
                "name" : "Andrezgz",
@@ -257,19 +258,24 @@
                "y" : 2
             },
             {
-               "drilldown" : "Athanasius",
+               "name" : "Arne Sommer",
+               "drilldown" : "Arne Sommer",
+               "y" : 3
+            },
+            {
                "y" : 4,
+               "drilldown" : "Athanasius",
                "name" : "Athanasius"
             },
             {
-               "drilldown" : "Dave Jacoby",
                "y" : 3,
+               "drilldown" : "Dave Jacoby",
                "name" : "Dave Jacoby"
             },
             {
-               "name" : "Duane Powell",
+               "y" : 2,
                "drilldown" : "Duane Powell",
-               "y" : 2
+               "name" : "Duane Powell"
             },
             {
                "name" : "E. Choroba",
@@ -278,28 +284,28 @@
             },
             {
                "name" : "Feng Chang",
-               "y" : 4,
-               "drilldown" : "Feng Chang"
+               "drilldown" : "Feng Chang",
+               "y" : 4
             },
             {
-               "y" : 2,
                "drilldown" : "Gustavo Chaves",
+               "y" : 2,
                "name" : "Gustavo Chaves"
             },
             {
-               "name" : "Kevin Colyer",
                "y" : 2,
-               "drilldown" : "Kevin Colyer"
+               "drilldown" : "Kevin Colyer",
+               "name" : "Kevin Colyer"
             },
             {
-               "name" : "Lubos Kolouch",
                "drilldown" : "Lubos Kolouch",
-               "y" : 2
+               "y" : 2,
+               "name" : "Lubos Kolouch"
             },
             {
-               "name" : "Mark Anderson",
                "drilldown" : "Mark Anderson",
-               "y" : 2
+               "y" : 2,
+               "name" : "Mark Anderson"
             },
             {
                "name" : "Martin Barth",
@@ -307,9 +313,9 @@
                "drilldown" : "Martin Barth"
             },
             {
-               "name" : "Noud",
+               "drilldown" : "Noud",
                "y" : 2,
-               "drilldown" : "Noud"
+               "name" : "Noud"
             },
             {
                "drilldown" : "Ozzy",
@@ -317,24 +323,24 @@
                "name" : "Ozzy"
             },
             {
-               "name" : "Pete Houston",
                "drilldown" : "Pete Houston",
-               "y" : 1
+               "y" : 1,
+               "name" : "Pete Houston"
             },
             {
-               "drilldown" : "Randy Lauen",
+               "name" : "Randy Lauen",
                "y" : 2,
-               "name" : "Randy Lauen"
+               "drilldown" : "Randy Lauen"
             },
             {
                "name" : "Roger Bell West",
-               "drilldown" : "Roger Bell West",
-               "y" : 4
+               "y" : 4,
+               "drilldown" : "Roger Bell West"
             },
             {
                "name" : "Ruben Westerberg",
-               "y" : 4,
-               "drilldown" : "Ruben Westerberg"
+               "drilldown" : "Ruben Westerberg",
+               "y" : 4
             },
             {
                "y" : 2,
@@ -342,12 +348,25 @@
                "name" : "Simon Proctor"
             },
             {
-               "y" : 2,
+               "name" : "Steven Wilson",
                "drilldown" : "Steven Wilson",
-               "name" : "Steven Wilson"
+               "y" : 2
             }
-         ],
-         "name" : "Perl Weekly Challenge - 020"
+         ]
       }
-   ]
+   ],
+   "yAxis" : {
+      "title" : {
+         "text" : "Total Solutions"
+      }
+   },
+   "title" : {
+      "text" : "Perl Weekly Challenge - 020"
+   },
+   "legend" : {
+      "enabled" : 0
+   },
+   "chart" : {
+      "type" : "column"
+   }
 }
diff --git a/stats/pwc-language-breakdown-summary.json b/stats/pwc-language-breakdown-summary.json
index bce0a9a9c7..fce0d5a975 100644
--- a/stats/pwc-language-breakdown-summary.json
+++ b/stats/pwc-language-breakdown-summary.json
@@ -2,22 +2,22 @@
    "series" : [
       {
          "dataLabels" : {
+            "color" : "#FFFFFF",
             "format" : "{point.y:.0f}",
-            "enabled" : "true",
             "align" : "right",
-            "rotation" : -90,
+            "enabled" : "true",
+            "y" : 10,
             "style" : {
-               "fontFamily" : "Verdana, sans-serif",
-               "fontSize" : "13px"
+               "fontSize" : "13px",
+               "fontFamily" : "Verdana, sans-serif"
             },
-            "color" : "#FFFFFF",
-            "y" : 10
+            "rotation" : -90
          },
          "name" : "Contributions",
          "data" : [
             [
                "Blog",
-               185
+               186
             ],
             [
                "Perl 5",
@@ -25,39 +25,39 @@
             ],
             [
                "Perl 6",
-               488
+               490
             ]
          ]
       }
    ],
-   "xAxis" : {
-      "labels" : {
-         "style" : {
-            "fontFamily" : "Verdana, sans-serif",
-            "fontSize" : "13px"
-         }
-      },
-      "type" : "category"
-   },
-   "subtitle" : {
-      "text" : "Last updated at 2019-08-10 19:51:50 GMT"
-   },
    "tooltip" : {
       "pointFormat" : "<b>{point.y:.0f}</b>"
    },
    "chart" : {
       "type" : "column"
    },
-   "title" : {
-      "text" : "Perl Weekly Challenge Contributions - 2019"
-   },
    "yAxis" : {
       "min" : 0,
       "title" : {
          "text" : null
       }
    },
+   "title" : {
+      "text" : "Perl Weekly Challenge Contributions - 2019"
+   },
+   "xAxis" : {
+      "labels" : {
+         "style" : {
+            "fontFamily" : "Verdana, sans-serif",
+            "fontSize" : "13px"
+         }
+      },
+      "type" : "category"
+   },
    "legend" : {
       "enabled" : "false"
+   },
+   "subtitle" : {
+      "text" : "Last updated at 2019-08-10 21:58:10 GMT"
    }
 }
diff --git a/stats/pwc-language-breakdown.json b/stats/pwc-language-breakdown.json
index 3ee3319cbf..79637f638d 100644
--- a/stats/pwc-language-breakdown.json
+++ b/stats/pwc-language-breakdown.json
@@ -1,8 +1,125 @@
 {
+   "tooltip" : {
+      "headerFormat" : "<span style=\"font-size:11px\"></span>",
+      "pointFormat" : "<span style=\"color:{point.color}\">Challenge {point.name}</span>: <b>{point.y:f}</b><br/>",
+      "followPointer" : "true"
+   },
+   "series" : [
+      {
+         "data" : [
+            {
+               "y" : 123,
+               "drilldown" : "001",
+               "name" : "#001"
+            },
+            {
+               "name" : "#002",
+               "drilldown" : "002",
+               "y" : 104
+            },
+            {
+               "name" : "#003",
+               "drilldown" : "003",
+               "y" : 66
+            },
+            {
+               "name" : "#004",
+               "drilldown" : "004",
+               "y" : 84
+            },
+            {
+               "drilldown" : "005",
+               "name" : "#005",
+               "y" : 66
+            },
+            {
+               "y" : 47,
+               "name" : "#006",
+               "drilldown" : "006"
+            },
+            {
+               "y" : 54,
+               "name" : "#007",
+               "drilldown" : "007"
+            },
+            {
+               "y" : 67,
+               "name" : "#008",
+               "drilldown" : "008"
+            },
+            {
+               "drilldown" : "009",
+               "name" : "#009",
+               "y" : 65
+            },
+            {
+               "drilldown" : "010",
+               "name" : "#010",
+               "y" : 58
+            },
+            {
+               "y" : 77,
+               "drilldown" : "011",
+               "name" : "#011"
+            },
+            {
+               "name" : "#012",
+               "drilldown" : "012",
+               "y" : 81
+            },
+            {
+               "name" : "#013",
+               "drilldown" : "013",
+               "y" : 74
+            },
+            {
+               "y" : 94,
+               "drilldown" : "014",
+               "name" : "#014"
+            },
+            {
+               "y" : 90,
+               "drilldown" : "015",
+               "name" : "#015"
+            },
+            {
+               "drilldown" : "016",
+               "name" : "#016",
+               "y" : 64
+            },
+            {
+               "drilldown" : "017",
+               "name" : "#017",
+               "y" : 77
+            },
+            {
+               "y" : 73,
+               "drilldown" : "018",
+               "name" : "#018"
+            },
+            {
+               "y" : 92,
+               "drilldown" : "019",
+               "name" : "#019"
+            },
+            {
+               "y" : 48,
+               "drilldown" : "020",
+               "name" : "#020"
+            }
+         ],
+         "name" : "Perl Weekly Challenge Languages",
+         "colorByPoint" : "true"
+      }
+   ],
+   "chart" : {
+      "type" : "column"
+   },
    "drilldown" : {
       "series" : [
          {
             "id" : "001",
+            "name" : "001",
             "data" : [
                [
                   "Perl 5",
@@ -16,11 +133,9 @@
                   "Blog",
                   10
                ]
-            ],
-            "name" : "001"
+            ]
          },
          {
-            "name" : "002",
             "data" : [
                [
                   "Perl 5",
@@ -35,10 +150,10 @@
                   9
                ]
             ],
-            "id" : "002"
+            "id" : "002",
+            "name" : "002"
          },
          {
-            "id" : "003",
             "data" : [
                [
                   "Perl 5",
@@ -53,10 +168,10 @@
                   8
                ]
             ],
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@@ -71,11 +186,12 @@
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@@ -92,6 +208,8 @@
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@@ -105,13 +223,9 @@
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@@ -125,11 +239,13 @@
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@@ -146,7 +262,6 @@
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@@ -161,9 +276,12 @@
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@@ -177,12 +295,11 @@
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@@ -215,10 +330,12 @@
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@@ -232,10 +349,11 @@
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@@ -269,11 +384,12 @@
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@@ -290,6 +406,7 @@
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@@ -304,8 +421,7 @@
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@@ -353,135 +469,16 @@
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