- Added solutions by Feng Chang.

27 files changed, 3532 insertions, 3494 deletions

diff --git a/challenge-016/feng-chang/perl6/ch-2.pl b/challenge-016/feng-chang/perl5/ch-2.pl
index 2995aa1d87..2995aa1d87 100755
--- a/challenge-016/feng-chang/perl6/ch-2.pl
+++ b/challenge-016/feng-chang/perl5/ch-2.pl
diff --git a/challenge-016/feng-chang/perl5/ch-1.p6 b/challenge-016/feng-chang/perl6/ch-1.p6
index 835c936ffd..835c936ffd 100755
--- a/challenge-016/feng-chang/perl5/ch-1.p6
+++ b/challenge-016/feng-chang/perl6/ch-1.p6
diff --git a/stats/pwc-challenge-001.json b/stats/pwc-challenge-001.json
index cafdd0d598..75418e65de 100644
--- a/stats/pwc-challenge-001.json
+++ b/stats/pwc-challenge-001.json
@@ -1,9 +1,4 @@
 {
-   "yAxis" : {
-      "title" : {
-         "text" : "Total Solutions"
-      }
-   },
    "chart" : {
       "type" : "column"
    },
@@ -11,6 +6,7 @@
       "series" : [
          {
             "name" : "Adam Russell",
+            "id" : "Adam Russell",
             "data" : [
                [
                   "Perl 5",
@@ -20,8 +16,7 @@
                   "Blog",
                   1
                ]
-            ],
-            "id" : "Adam Russell"
+            ]
          },
          {
             "data" : [
@@ -64,47 +59,46 @@
             "id" : "Antonio Gamiz"
          },
          {
-            "id" : "Arpad Toth",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
             ],
+            "id" : "Arpad Toth",
             "name" : "Arpad Toth"
          },
          {
-            "name" : "Athanasius",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
             ],
+            "name" : "Athanasius",
             "id" : "Athanasius"
          },
          {
-            "name" : "Bob Kleemann",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
             ],
+            "name" : "Bob Kleemann",
             "id" : "Bob Kleemann"
          },
          {
-            "id" : "Daniel Mantovani",
             "data" : [
                [
                   "Perl 5",
                   1
                ]
             ],
-            "name" : "Daniel Mantovani"
+            "name" : "Daniel Mantovani",
+            "id" : "Daniel Mantovani"
          },
          {
-            "id" : "Dave Cross",
             "data" : [
                [
                   "Perl 5",
@@ -115,6 +109,7 @@
                   1
                ]
             ],
+            "id" : "Dave Cross",
             "name" : "Dave Cross"
          },
          {
@@ -133,26 +128,27 @@
          },
          {
             "name" : "David Kayal",
+            "id" : "David Kayal",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
-            ],
-            "id" : "David Kayal"
+            ]
          },
          {
-            "id" : "Doug Schrag",
             "data" : [
                [
                   "Perl 6",
                   2
                ]
             ],
-            "name" : "Doug Schrag"
+            "name" : "Doug Schrag",
+            "id" : "Doug Schrag"
          },
          {
             "id" : "Dr James A. Smith",
+            "name" : "Dr James A. Smith",
             "data" : [
                [
                   "Perl 5",
@@ -162,71 +158,71 @@
                   "Perl 6",
                   2
                ]
-            ],
-            "name" : "Dr James A. Smith"
+            ]
          },
          {
-            "id" : "Duncan C. White",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
             ],
+            "id" : "Duncan C. White",
             "name" : "Duncan C. White"
          },
          {
+            "id" : "Eddy HS",
             "name" : "Eddy HS",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
-            ],
-            "id" : "Eddy HS"
+            ]
          },
          {
+            "id" : "Finley",
+            "name" : "Finley",
             "data" : [
                [
                   "Perl 6",
                   2
                ]
-            ],
-            "name" : "Finley",
-            "id" : "Finley"
+            ]
          },
          {
-            "name" : "Fred Zinn",
             "data" : [
                [
                   "Perl 5",
                   1
                ]
             ],
+            "name" : "Fred Zinn",
             "id" : "Fred Zinn"
          },
          {
             "id" : "Freddie B",
+            "name" : "Freddie B",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
-            ],
-            "name" : "Freddie B"
+            ]
          },
          {
-            "id" : "Gustavo Chaves",
             "data" : [
                [
                   "Perl 5",
                   1
                ]
             ],
-            "name" : "Gustavo Chaves"
+            "name" : "Gustavo Chaves",
+            "id" : "Gustavo Chaves"
          },
          {
             "name" : "JJ Merelo",
+            "id" : "JJ Merelo",
             "data" : [
                [
                   "Perl 6",
@@ -236,10 +232,11 @@
                   "Blog",
                   1
                ]
-            ],
-            "id" : "JJ Merelo"
+            ]
          },
          {
+            "id" : "Jaldhar H. Vyas",
+            "name" : "Jaldhar H. Vyas",
             "data" : [
                [
                   "Perl 5",
@@ -249,23 +246,21 @@
                   "Perl 6",
                   2
                ]
-            ],
-            "name" : "Jaldhar H. Vyas",
-            "id" : "Jaldhar H. Vyas"
+            ]
          },
          {
-            "id" : "Jeff",
-            "name" : "Jeff",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
-            ]
+            ],
+            "name" : "Jeff",
+            "id" : "Jeff"
          },
          {
-            "id" : "Jeremy Carman",
             "name" : "Jeremy Carman",
+            "id" : "Jeremy Carman",
             "data" : [
                [
                   "Perl 5",
@@ -288,8 +283,6 @@
             "id" : "Jim Bacon"
          },
          {
-            "id" : "Jo Christian Oterhals",
-            "name" : "Jo Christian Oterhals",
             "data" : [
                [
                   "Perl 5",
@@ -303,7 +296,9 @@
                   "Blog",
                   1
                ]
-            ]
+            ],
+            "id" : "Jo Christian Oterhals",
+            "name" : "Jo Christian Oterhals"
          },
          {
             "data" : [
@@ -320,28 +315,28 @@
             "id" : "Joelle Maslak"
          },
          {
-            "name" : "John Barrett",
             "data" : [
                [
                   "Perl 5",
                   1
                ]
             ],
+            "name" : "John Barrett",
             "id" : "John Barrett"
          },
          {
-            "name" : "Juan Caballero",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
             ],
-            "id" : "Juan Caballero"
+            "id" : "Juan Caballero",
+            "name" : "Juan Caballero"
          },
          {
-            "id" : "Khalid",
             "name" : "Khalid",
+            "id" : "Khalid",
             "data" : [
                [
                   "Perl 5",
@@ -350,6 +345,8 @@
             ]
          },
          {
+            "id" : "Kian-Meng Ang",
+            "name" : "Kian-Meng Ang",
             "data" : [
                [
                   "Perl 5",
@@ -359,9 +356,7 @@
                   "Blog",
                   1
                ]
-            ],
-            "name" : "Kian-Meng Ang",
-            "id" : "Kian-Meng Ang"
+            ]
          },
          {
             "id" : "Kivanc Yazan",
@@ -374,7 +369,6 @@
             ]
          },
          {
-            "id" : "Lars Balker",
             "data" : [
                [
                   "Perl 5",
@@ -385,10 +379,10 @@
                   2
                ]
             ],
+            "id" : "Lars Balker",
             "name" : "Lars Balker"
          },
          {
-            "id" : "Laurent Rosenfeld",
             "data" : [
                [
                   "Perl 5",
@@ -403,6 +397,7 @@
                   1
                ]
             ],
+            "id" : "Laurent Rosenfeld",
             "name" : "Laurent Rosenfeld"
          },
          {
@@ -416,28 +411,26 @@
             ]
          },
          {
-            "name" : "Martin Mugeni",
             "data" : [
                [
                   "Perl 6",
                   2
                ]
             ],
-            "id" : "Martin Mugeni"
+            "id" : "Martin Mugeni",
+            "name" : "Martin Mugeni"
          },
          {
+            "id" : "Neil Bowers",
+            "name" : "Neil Bowers",
             "data" : [
                [
                   "Perl 5",
                   1
                ]
-            ],
-            "name" : "Neil Bowers",
-            "id" : "Neil Bowers"
+            ]
          },
          {
-            "id" : "Nick Logan",
-            "name" : "Nick Logan",
             "data" : [
                [
                   "Perl 5",
@@ -447,51 +440,53 @@
                   "Perl 6",
                   2
                ]
-            ]
+            ],
+            "id" : "Nick Logan",
+            "name" : "Nick Logan"
          },
          {
             "id" : "Oleksii Tsvietnov",
+            "name" : "Oleksii Tsvietnov",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
-            ],
-            "name" : "Oleksii Tsvietnov"
+            ]
          },
          {
+            "name" : "Ozzy",
+            "id" : "Ozzy",
             "data" : [
                [
                   "Perl 6",
                   2
                ]
-            ],
-            "name" : "Ozzy",
-            "id" : "Ozzy"
+            ]
          },
          {
             "name" : "Pavel Jurca",
+            "id" : "Pavel Jurca",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
-            ],
-            "id" : "Pavel Jurca"
+            ]
          },
          {
             "name" : "Pete Houston",
+            "id" : "Pete Houston",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
-            ],
-            "id" : "Pete Houston"
+            ]
          },
          {
-            "id" : "Philippe Bruhat",
             "name" : "Philippe Bruhat",
+            "id" : "Philippe Bruhat",
             "data" : [
                [
                   "Perl 5",
@@ -520,8 +515,8 @@
                   2
                ]
             ],
-            "name" : "Sean Meininger",
-            "id" : "Sean Meininger"
+            "id" : "Sean Meininger",
+            "name" : "Sean Meininger"
          },
          {
             "data" : [
@@ -538,8 +533,8 @@
                   2
                ]
             ],
-            "name" : "Simon Proctor",
-            "id" : "Simon Proctor"
+            "id" : "Simon Proctor",
+            "name" : "Simon Proctor"
          },
          {
             "data" : [
@@ -552,6 +547,8 @@
             "id" : "Simon Reinhardt"
          },
          {
+            "id" : "Steve Rogerson",
+            "name" : "Steve Rogerson",
             "data" : [
                [
                   "Perl 5",
@@ -561,9 +558,7 @@
                   "Perl 6",
                   2
                ]
-            ],
-            "name" : "Steve Rogerson",
-            "id" : "Steve Rogerson"
+            ]
          },
          {
             "id" : "Steven Wilson",
@@ -587,38 +582,71 @@
          },
          {
             "name" : "Tore Andersson",
+            "id" : "Tore Andersson",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
-            ],
-            "id" : "Tore Andersson"
+            ]
          },
          {
-            "id" : "Veesh Goldman",
-            "name" : "Veesh Goldman",
             "data" : [
                [
                   "Perl 5",
                   1
                ]
-            ]
+            ],
+            "name" : "Veesh Goldman",
+            "id" : "Veesh Goldman"
          },
          {
+            "name" : "William Gilmore",
+            "id" : "William Gilmore",
             "data" : [
                [
                   "Perl 5",
                   1
                ]
-            ],
-            "name" : "William Gilmore",
-            "id" : "William Gilmore"
+            ]
          }
       ]
    },
+   "yAxis" : {
+      "title" : {
+         "text" : "Total Solutions"
+      }
+   },
+   "tooltip" : {
+      "headerFormat" : "<span style='font-size:11px'>{series.name}</span><br/>",
+      "followPointer" : 1,
+      "pointFormat" : "<span style='color:{point.color}'>{point.name}</span>: <b>{point.y:f}</b><br/>"
+   },
+   "subtitle" : {
+      "text" : "[Champions: 53] Last updated at 2019-07-14 19:52:48 GMT"
+   },
+   "plotOptions" : {
+      "series" : {
+         "dataLabels" : {
+            "format" : "{point.y}",
+            "enabled" : 1
+         },
+         "borderWidth" : 0
+      }
+   },
+   "legend" : {
+      "enabled" : 0
+   },
+   "xAxis" : {
+      "type" : "category"
+   },
+   "title" : {
+      "text" : "Perl Weekly Challenge - 001"
+   },
    "series" : [
       {
+         "name" : "Perl Weekly Challenge - 001",
+         "colorByPoint" : 1,
          "data" : [
             {
                "drilldown" : "Adam Russell",
@@ -626,103 +654,103 @@
                "y" : 3
             },
             {
-               "drilldown" : "Ailbhe Tweedie",
                "y" : 1,
-               "name" : "Ailbhe Tweedie"
+               "name" : "Ailbhe Tweedie",
+               "drilldown" : "Ailbhe Tweedie"
             },
             {
+               "name" : "Alex Daniel",
                "drilldown" : "Alex Daniel",
-               "y" : 2,
-               "name" : "Alex Daniel"
+               "y" : 2
             },
             {
-               "y" : 2,
+               "drilldown" : "Andrezgz",
                "name" : "Andrezgz",
-               "drilldown" : "Andrezgz"
+               "y" : 2
             },
             {
-               "drilldown" : "Antonio Gamiz",
                "name" : "Antonio Gamiz",
+               "drilldown" : "Antonio Gamiz",
                "y" : 2
             },
             {
                "y" : 2,
-               "name" : "Arpad Toth",
-               "drilldown" : "Arpad Toth"
+               "drilldown" : "Arpad Toth",
+               "name" : "Arpad Toth"
             },
             {
-               "drilldown" : "Athanasius",
                "y" : 2,
+               "drilldown" : "Athanasius",
                "name" : "Athanasius"
             },
             {
-               "y" : 2,
+               "drilldown" : "Bob Kleemann",
                "name" : "Bob Kleemann",
-               "drilldown" : "Bob Kleemann"
+               "y" : 2
             },
             {
                "y" : 1,
-               "name" : "Daniel Mantovani",
-               "drilldown" : "Daniel Mantovani"
+               "drilldown" : "Daniel Mantovani",
+               "name" : "Daniel Mantovani"
             },
             {
+               "name" : "Dave Cross",
                "drilldown" : "Dave Cross",
-               "y" : 3,
-               "name" : "Dave Cross"
+               "y" : 3
             },
             {
-               "y" : 2,
                "name" : "Dave Jacoby",
-               "drilldown" : "Dave Jacoby"
+               "drilldown" : "Dave Jacoby",
+               "y" : 2
             },
             {
-               "drilldown" : "David Kayal",
                "name" : "David Kayal",
+               "drilldown" : "David Kayal",
                "y" : 2
             },
             {
-               "name" : "Doug Schrag",
                "y" : 2,
+               "name" : "Doug Schrag",
                "drilldown" : "Doug Schrag"
             },
             {
-               "drilldown" : "Dr James A. Smith",
                "y" : 4,
-               "name" : "Dr James A. Smith"
+               "name" : "Dr James A. Smith",
+               "drilldown" : "Dr James A. Smith"
             },
             {
-               "drilldown" : "Duncan C. White",
                "y" : 2,
+               "drilldown" : "Duncan C. White",
                "name" : "Duncan C. White"
             },
             {
+               "drilldown" : "Eddy HS",
                "name" : "Eddy HS",
-               "y" : 2,
-               "drilldown" : "Eddy HS"
+               "y" : 2
             },
             {
-               "drilldown" : "Finley",
+               "y" : 2,
                "name" : "Finley",
-               "y" : 2
+               "drilldown" : "Finley"
             },
             {
-               "name" : "Fred Zinn",
                "y" : 1,
+               "name" : "Fred Zinn",
                "drilldown" : "Fred Zinn"
             },
             {
+               "name" : "Freddie B",
                "drilldown" : "Freddie B",
-               "y" : 2,
-               "name" : "Freddie B"
+               "y" : 2
             },
             {
+               "name" : "Gustavo Chaves",
                "drilldown" : "Gustavo Chaves",
-               "y" : 1,
-               "name" : "Gustavo Chaves"
+               "y" : 1
             },
             {
-               "drilldown" : "JJ Merelo",
                "name" : "JJ Merelo",
+               "drilldown" : "JJ Merelo",
                "y" : 2
             },
             {
@@ -731,54 +759,54 @@
                "drilldown" : "Jaldhar H. Vyas"
             },
             {
+               "name" : "Jeff",
                "drilldown" : "Jeff",
-               "y" : 2,
-               "name" : "Jeff"
+               "y" : 2
             },
             {
-               "drilldown" : "Jeremy Carman",
                "name" : "Jeremy Carman",
+               "drilldown" : "Jeremy Carman",
                "y" : 2
             },
             {
-               "drilldown" : "Jim Bacon",
                "y" : 1,
-               "name" : "Jim Bacon"
+               "name" : "Jim Bacon",
+               "drilldown" : "Jim Bacon"
             },
             {
-               "name" : "Jo Christian Oterhals",
                "y" : 5,
-               "drilldown" : "Jo Christian Oterhals"
+               "drilldown" : "Jo Christian Oterhals",
+               "name" : "Jo Christian Oterhals"
             },
             {
-               "name" : "Joelle Maslak",
                "y" : 4,
-               "drilldown" : "Joelle Maslak"
+               "drilldown" : "Joelle Maslak",
+               "name" : "Joelle Maslak"
             },
             {
-               "drilldown" : "John Barrett",
+               "y" : 1,
                "name" : "John Barrett",
-               "y" : 1
+               "drilldown" : "John Barrett"
             },
             {
-               "drilldown" : "Juan Caballero",
+               "y" : 2,
                "name" : "Juan Caballero",
-               "y" : 2
+               "drilldown" : "Juan Caballero"
             },
             {
                "drilldown" : "Khalid",
-               "y" : 2,
-               "name" : "Khalid"
+               "name" : "Khalid",
+               "y" : 2
             },
             {
-               "drilldown" : "Kian-Meng Ang",
                "y" : 3,
+               "drilldown" : "Kian-Meng Ang",
                "name" : "Kian-Meng Ang"
             },
             {
+               "y" : 2,
                "drilldown" : "Kivanc Yazan",
-               "name" : "Kivanc Yazan",
-               "y" : 2
+               "name" : "Kivanc Yazan"
             },
             {
                "drilldown" : "Lars Balker",
@@ -786,19 +814,19 @@
                "y" : 4
             },
             {
-               "name" : "Laurent Rosenfeld",
                "y" : 4,
+               "name" : "Laurent Rosenfeld",
                "drilldown" : "Laurent Rosenfeld"
             },
             {
+               "name" : "Mark Senn",
                "drilldown" : "Mark Senn",
-               "y" : 2,
-               "name" : "Mark Senn"
+               "y" : 2
             },
             {
+               "y" : 2,
                "drilldown" : "Martin Mugeni",
-               "name" : "Martin Mugeni",
-               "y" : 2
+               "name" : "Martin Mugeni"
             },
             {
                "drilldown" : "Neil Bowers",
@@ -806,14 +834,14 @@
                "y" : 1
             },
             {
-               "drilldown" : "Nick Logan",
                "y" : 4,
-               "name" : "Nick Logan"
+               "name" : "Nick Logan",
+               "drilldown" : "Nick Logan"
             },
             {
+               "y" : 2,
                "drilldown" : "Oleksii Tsvietnov",
-               "name" : "Oleksii Tsvietnov",
-               "y" : 2
+               "name" : "Oleksii Tsvietnov"
             },
             {
                "drilldown" : "Ozzy",
@@ -822,13 +850,13 @@
             },
             {
                "y" : 2,
-               "name" : "Pavel Jurca",
-               "drilldown" : "Pavel Jurca"
+               "drilldown" : "Pavel Jurca",
+               "name" : "Pavel Jurca"
             },
             {
+               "name" : "Pete Houston",
                "drilldown" : "Pete Houston",
-               "y" : 2,
-               "name" : "Pete Houston"
+               "y" : 2
             },
             {
                "drilldown" : "Philippe Bruhat",
@@ -841,29 +869,29 @@
                "drilldown" : "Prajith P"
             },
             {
+               "name" : "Sean Meininger",
                "drilldown" : "Sean Meininger",
-               "y" : 2,
-               "name" : "Sean Meininger"
+               "y" : 2
             },
             {
+               "y" : 6,
                "drilldown" : "Simon Proctor",
-               "name" : "Simon Proctor",
-               "y" : 6
+               "name" : "Simon Proctor"
             },
             {
                "y" : 2,
-               "name" : "Simon Reinhardt",
-               "drilldown" : "Simon Reinhardt"
+               "drilldown" : "Simon Reinhardt",
+               "name" : "Simon Reinhardt"
             },
             {
-               "y" : 4,
                "name" : "Steve Rogerson",
-               "drilldown" : "Steve Rogerson"
+               "drilldown" : "Steve Rogerson",
+               "y" : 4
             },
             {
                "drilldown" : "Steven Wilson",
-               "y" : 2,
-               "name" : "Steven Wilson"
+               "name" : "Steven Wilson",
+               "y" : 2
             },
             {
                "y" : 1,
@@ -871,49 +899,21 @@
                "drilldown" : "Tiago Stock"
             },
             {
+               "name" : "Tore Andersson",
                "drilldown" : "Tore Andersson",
-               "y" : 2,
-               "name" : "Tore Andersson"
+               "y" : 2
             },
             {
+               "name" : "Veesh Goldman",
                "drilldown" : "Veesh Goldman",
-               "y" : 1,
-               "name" : "Veesh Goldman"
+               "y" : 1
             },
             {
                "y" : 1,
-               "name" : "William Gilmore",
-               "drilldown" : "William Gilmore"
+               "drilldown" : "William Gilmore",
+               "name" : "William Gilmore"
             }
-         ],
-         "colorByPoint" : 1,
-         "name" : "Perl Weekly Challenge - 001"
+         ]
       }
-   ],
-   "tooltip" : {
-      "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/>",
-      "followPointer" : 1
-   },
-   "subtitle" : {
-      "text" : "[Champions: 53] Last updated at 2019-07-14 06:05:14 GMT"
-   },
-   "legend" : {
-      "enabled" : 0
-   },
-   "plotOptions" : {
-      "series" : {
-         "borderWidth" : 0,
-         "dataLabels" : {
-            "enabled" : 1,
-            "format" : "{point.y}"
-         }
-      }
-   },
-   "title" : {
-      "text" : "Perl Weekly Challenge - 001"
-   },
-   "xAxis" : {
-      "type" : "category"
-   }
+   ]
 }
diff --git a/stats/pwc-challenge-002.json b/stats/pwc-challenge-002.json
index 359a661e9a..1017afa8e3 100644
--- a/