- Added solutions by Robert McIntosh.

- Added solutions by Richard Park.
- Added solutions by Andreas Mahnke.
- Added solutions by Lubos Kolouch.
- Added solutions by Steven Wilson.
- Added solutions by Peter Campbell Smith.
- Added solutions by Conor Hoekstra.
- Added solutions by Robbie Hatley.

33 files changed, 3237 insertions, 3074 deletions

diff --git a/challenge-308/conor-hoekstra/ch-1.bqn b/challenge-308/conor-hoekstra/bqn/ch-1.bqn
index 2e986bd207..2e986bd207 100644
--- a/challenge-308/conor-hoekstra/ch-1.bqn
+++ b/challenge-308/conor-hoekstra/bqn/ch-1.bqn
diff --git a/challenge-308/conor-hoekstra/ch-2.bqn b/challenge-308/conor-hoekstra/bqn/ch-2.bqn
index 695c1b53f3..695c1b53f3 100644
--- a/challenge-308/conor-hoekstra/ch-2.bqn
+++ b/challenge-308/conor-hoekstra/bqn/ch-2.bqn
diff --git a/challenge-308/richard-park/apl/CountCommon.aplf b/challenge-308/richard-park/apl/CountCommon.aplf
new file mode 100644
index 0000000000..ac2d5a17e2
--- /dev/null
+++ b/challenge-308/richard-park/apl/CountCommon.aplf
@@ -0,0 +1,10 @@
+ CountCommon←{
+⍝ Can be defined as the 2-train atop
+     CountCommon←≢∩
+⍝ Literally "count the intersection"
+⍝             ≢             ∩
+⍝ Example
+⍝       'perl' 'weekly' 'challenge' (≢∩) 'raku' 'weekly' 'challenge'
+⍝ 2
+     ≢⍺∩⍵
+ }
diff --git a/challenge-308/richard-park/apl/DecodeXOR.aplf b/challenge-308/richard-park/apl/DecodeXOR.aplf
new file mode 100644
index 0000000000..a2c2cb7b2b
--- /dev/null
+++ b/challenge-308/richard-park/apl/DecodeXOR.aplf
@@ -0,0 +1,15 @@
+ DecodeXOR←{
+⍝ ⍺: initial
+⍝ ⍵: encoded sequence
+⍝ ←: original array that produced ⍵
+⍝    ⍵ ← 2{2⊥≠/2⊥⍣¯1⊢⍵}/original
+     0∊⍴⍵:⍺
+     nxt←2⊥≠/2⊥⍣¯1⊢⍺,⊃⍵
+     ⍺,nxt ∇ 1↓⍵
+
+⍝ Examples:
+⍝       1 DecodeXOR 1 2 3
+⍝ 1 0 2 1
+⍝       4 DecodeXOR 6 2 7 3
+⍝ 4 2 0 7 4
+ }
diff --git a/challenge-308/robert-mcintosh/blog.txt b/challenge-308/robert-mcintosh/blog.txt
new file mode 100644
index 0000000000..e41850ae6d
--- /dev/null
+++ b/challenge-308/robert-mcintosh/blog.txt
@@ -0,0 +1 @@
+https://dev.to/rcmcintosh/my-python-and-raku-language-solutions-to-task-1-count-common-from-the-weekly-challenge-308-3a2b
diff --git a/challenge-308/robert-mcintosh/blog1.txt b/challenge-308/robert-mcintosh/blog1.txt
new file mode 100644
index 0000000000..3b56b91d9b
--- /dev/null
+++ b/challenge-308/robert-mcintosh/blog1.txt
@@ -0,0 +1 @@
+https://dev.to/rcmcintosh/my-python-language-solution-to-task-2-decode-xor-from-the-weekly-challenge-308-3a3i
diff --git a/challenge-308/robert-mcintosh/python/ch-1.py b/challenge-308/robert-mcintosh/python/ch-1.py
new file mode 100644
index 0000000000..4e746d6562
--- /dev/null
+++ b/challenge-308/robert-mcintosh/python/ch-1.py
@@ -0,0 +1,2 @@
+def count_common(str1: [str], str2: [str]) -> int:
+    return len(set(str1).intersection(set(str2)))
diff --git a/challenge-308/robert-mcintosh/python/ch-2.py b/challenge-308/robert-mcintosh/python/ch-2.py
new file mode 100644
index 0000000000..050fe8c30c
--- /dev/null
+++ b/challenge-308/robert-mcintosh/python/ch-2.py
@@ -0,0 +1,8 @@
+def decode(encoded: list[int], initial: int) -> [int]:
+    original = [
+        initial,
+    ]
+    for encoded_element in encoded:
+        original_element = original[-1] ^ encoded_element
+        original.append(original_element)
+    return original
diff --git a/challenge-308/robert-mcintosh/raku/ch-1.raku b/challenge-308/robert-mcintosh/raku/ch-1.raku
new file mode 100644
index 0000000000..a1f54bb29d
--- /dev/null
+++ b/challenge-308/robert-mcintosh/raku/ch-1.raku
@@ -0,0 +1,5 @@
+sub count_common (@str1, @str2) {
+    my $set1 = set @str1;
+    my $set2 = set @str2;
+    return ($set1 (&) $set2).elems;
+}
diff --git a/stats/pwc-challenge-307.json b/stats/pwc-challenge-307.json
index 194489719e..ce4bd5bb0f 100644
--- a/stats/pwc-challenge-307.json
+++ b/stats/pwc-challenge-307.json
@@ -1,165 +1,12 @@
 {
-   "subtitle" : {
-      "text" : "[Champions: 25] Last updated at 2025-02-10 20:38:56 GMT"
-   },
-   "xAxis" : {
-      "type" : "category"
-   },
-   "tooltip" : {
-      "pointFormat" : "<span style='color:{point.color}'>{point.name}</span>: <b>{point.y:f}</b><br/>",
-      "followPointer" : 1,
-      "headerFormat" : "<span style='font-size:11px'>{series.name}</span><br/>"
-   },
-   "title" : {
-      "text" : "The Weekly Challenge - 307"
-   },
    "plotOptions" : {
       "series" : {
+         "borderWidth" : 0,
          "dataLabels" : {
-            "enabled" : 1,
-            "format" : "{point.y}"
-         },
-         "borderWidth" : 0
-      }
-   },
-   "series" : [
-      {
-         "colorByPoint" : 1,
-         "data" : [
-            {
-               "name" : "Ali Moradi",
-               "y" : 3,
-               "drilldown" : "Ali Moradi"
-            },
-            {
-               "drilldown" : "Andreas Mahnke",
-               "name" : "Andreas Mahnke",
-               "y" : 2
-            },
-            {
-               "drilldown" : "Arne Sommer",
-               "y" : 3,
-               "name" : "Arne Sommer"
-            },
-            {
-               "y" : 4,
-               "name" : "Athanasius",
-               "drilldown" : "Athanasius"
-            },
-            {
-               "name" : "BarrOff",
-               "y" : 2,
-               "drilldown" : "BarrOff"
-            },
-            {
-               "drilldown" : "Bob Lied",
-               "name" : "Bob Lied",
-               "y" : 2
-            },
-            {
-               "name" : "Dave Jacoby",
-               "y" : 2,
-               "drilldown" : "Dave Jacoby"
-            },
-            {
-               "y" : 2,
-               "name" : "David Ferrone",
-               "drilldown" : "David Ferrone"
-            },
-            {
-               "y" : 2,
-               "name" : "E. Choroba",
-               "drilldown" : "E. Choroba"
-            },
-            {
-               "name" : "Jaldhar H. Vyas",
-               "y" : 5,
-               "drilldown" : "Jaldhar H. Vyas"
-            },
-            {
-               "drilldown" : "Jan Krnavek",
-               "name" : "Jan Krnavek",
-               "y" : 2
-            },
-            {
-               "y" : 3,
-               "name" : "Jorg Sommrey",
-               "drilldown" : "Jorg Sommrey"
-            },
-            {
-               "drilldown" : "Lubos Kolouch",
-               "name" : "Lubos Kolouch",
-               "y" : 2
-            },
-            {
-               "drilldown" : "Mark Anderson",
-               "name" : "Mark Anderson",
-               "y" : 2
-            },
-            {
-               "y" : 3,
-               "name" : "Matthias Muth",
-               "drilldown" : "Matthias Muth"
-            },
-            {
-               "drilldown" : "Peter Campbell Smith",
-               "y" : 3,
-               "name" : "Peter Campbell Smith"
-            },
-            {
-               "drilldown" : "Peter Meszaros",
-               "y" : 2,
-               "name" : "Peter Meszaros"
-            },
-            {
-               "y" : 2,
-               "name" : "Robert Ransbottom",
-               "drilldown" : "Robert Ransbottom"
-            },
-            {
-               "name" : "Roger Bell_West",
-               "y" : 5,
-               "drilldown" : "Roger Bell_West"
-            },
-            {
-               "name" : "Simon Green",
-               "y" : 3,
-               "drilldown" : "Simon Green"
-            },
-            {
-               "name" : "Steven Wilson",
-               "y" : 2,
-               "drilldown" : "Steven Wilson"
-            },
-            {
-               "name" : "Thomas Kohler",
-               "y" : 4,
-               "drilldown" : "Thomas Kohler"
-            },
-            {
-               "y" : 4,
-               "name" : "Ulrich Rieke",
-               "drilldown" : "Ulrich Rieke"
-            },
-            {
-               "drilldown" : "W. Luis Mochan",
-               "name" : "W. Luis Mochan",
-               "y" : 3
-            },
-            {
-               "drilldown" : "Wanderdoc",
-               "name" : "Wanderdoc",
-               "y" : 2
-            }
-         ],
-         "name" : "The Weekly Challenge - 307"
+            "format" : "{point.y}",
+            "enabled" : 1
+         }
       }
-   ],
-   "chart" : {
-      "type" : "column"
-   },
-   "legend" : {
-      "enabled" : 0
    },
    "yAxis" : {
       "title" : {
@@ -193,6 +40,7 @@
             "id" : "Andreas Mahnke"
          },
          {
+            "id" : "Arne Sommer",
             "name" : "Arne Sommer",
             "data" : [
                [
@@ -203,11 +51,9 @@
                   "Blog",
                   1
                ]
-            ],
-            "id" : "Arne Sommer"
+            ]
          },
          {
-            "id" : "Athanasius",
             "name" : "Athanasius",
             "data" : [
                [
@@ -218,46 +64,47 @@
                   "Raku",
                   2
                ]
-            ]
+            ],
+            "id" : "Athanasius"
          },
          {
+            "name" : "BarrOff",
             "data" : [
                [
                   "Raku",
                   2
                ]
             ],
-            "name" : "BarrOff",
             "id" : "BarrOff"
          },
          {
+            "id" : "Bob Lied",
             "name" : "Bob Lied",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ],
-            "id" : "Bob Lied"
+            ]
          },
          {
-            "id" : "Dave Jacoby",
             "name" : "Dave Jacoby",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ]
+            ],
+            "id" : "Dave Jacoby"
          },
          {
+            "name" : "David Ferrone",
             "data" : [
                [
                   "Perl",
                   2
                ]
             ],
-            "name" : "David Ferrone",
             "id" : "David Ferrone"
          },
          {
@@ -271,6 +118,7 @@
             ]
          },
          {
+            "id" : "Jaldhar H. Vyas",
             "name" : "Jaldhar H. Vyas",
             "data" : [
                [
@@ -285,20 +133,20 @@
                   "Blog",
                   1
                ]
-            ],
-            "id" : "Jaldhar H. Vyas"
+            ]
          },
          {
-            "name" : "Jan Krnavek",
+            "id" : "Jan Krnavek",
             "data" : [
                [
                   "Raku",
                   2
                ]
             ],
-            "id" : "Jan Krnavek"
+            "name" : "Jan Krnavek"
          },
          {
+            "id" : "Jorg Sommrey",
             "data" : [
                [
                   "Perl",
@@ -309,31 +157,29 @@
                   1
                ]
             ],
-            "name" : "Jorg Sommrey",
-            "id" : "Jorg Sommrey"
+            "name" : "Jorg Sommrey"
          },
          {
+            "id" : "Lubos Kolouch",
             "name" : "Lubos Kolouch",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ],
-            "id" : "Lubos Kolouch"
+            ]
          },
          {
+            "id" : "Mark Anderson",
+            "name" : "Mark Anderson",
             "data" : [
                [
                   "Raku",
                   2
                ]
-            ],
-            "name" : "Mark Anderson",
-            "id" : "Mark Anderson"
+            ]
          },
          {
-            "id" : "Matthias Muth",
             "name" : "Matthias Muth",
             "data" : [
                [
@@ -344,10 +190,10 @@
                   "Blog",
                   1
                ]
-            ]
+            ],
+            "id" : "Matthias Muth"
          },
          {
-            "id" : "Peter Campbell Smith",
             "data" : [
                [
                   "Perl",
@@ -358,7 +204,8 @@
                   1
                ]
             ],
-            "name" : "Peter Campbell Smith"
+            "name" : "Peter Campbell Smith",
+            "id" : "Peter Campbell Smith"
          },
          {
             "name" : "Peter Meszaros",
@@ -371,16 +218,31 @@
             "id" : "Peter Meszaros"
          },
          {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ],
+            "name" : "Robbie Hatley",
+            "id" : "Robbie Hatley"
+         },
+         {
+            "id" : "Robert Ransbottom",
             "name" : "Robert Ransbottom",
             "data" : [
                [
                   "Raku",
                   2
                ]
-            ],
-            "id" : "Robert Ransbottom"
+            ]
          },
          {
+            "name" : "Roger Bell_West",
             "data" : [
                [
                   "Perl",
@@ -395,11 +257,10 @@
                   1
                ]
             ],
-            "name" : "Roger Bell_West",
             "id" : "Roger Bell_West"
          },
          {
-            "name" : "Simon Green",
+            "id" : "Simon Green",
             "data" : [
                [
                   "Perl",
@@ -410,19 +271,20 @@
                   1
                ]
             ],
-            "id" : "Simon Green"
+            "name" : "Simon Green"
          },
          {
-            "id" : "Steven Wilson",
             "name" : "Steven Wilson",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ]
+            ],
+            "id" : "Steven Wilson"
          },
          {
+            "id" : "Thomas Kohler",
             "data" : [
                [
                   "Perl",
@@ -433,8 +295,7 @@
                   2
                ]
             ],
-            "name" : "Thomas Kohler",
-            "id" : "Thomas Kohler"
+            "name" : "Thomas Kohler"
          },
          {
             "id" : "Ulrich Rieke",
@@ -451,6 +312,8 @@
             "name" : "Ulrich Rieke"
          },
          {
+            "id" : "W. Luis Mochan",
+            "name" : "W. Luis Mochan",
             "data" : [
                [
                   "Perl",
@@ -460,9 +323,7 @@
                   "Blog",
                   1
                ]
-            ],
-            "name" : "W. Luis Mochan",
-            "id" : "W. Luis Mochan"
+            ]
          },
          {
             "data" : [
@@ -475,5 +336,163 @@
             "id" : "Wanderdoc"
          }
       ]
+   },
+   "tooltip" : {
+      "pointFormat" : "<span style='color:{point.color}'>{point.name}</span>: <b>{point.y:f}</b><br/>",
+      "followPointer" : 1,
+      "headerFormat" : "<span style='font-size:11px'>{series.name}</span><br/>"
+   },
+   "title" : {
+      "text" : "The Weekly Challenge - 307"
+   },
+   "series" : [
+      {
+         "name" : "The Weekly Challenge - 307",
+         "data" : [
+            {
+               "drilldown" : "Ali Moradi",
+               "y" : 3,
+               "name" : "Ali Moradi"
+            },
+            {
+               "name" : "Andreas Mahnke",
+               "y" : 2,
+               "drilldown" : "Andreas Mahnke"
+            },
+            {
+               "drilldown" : "Arne Sommer",
+               "y" : 3,
+               "name" : "Arne Sommer"
+            },
+            {
+               "y" : 4,
+               "name" : "Athanasius",
+               "drilldown" : "Athanasius"
+            },
+            {
+               "name" : "BarrOff",
+               "y" : 2,
+               "drilldown" : "BarrOff"
+            },
+            {
+               "y" : 2,
+               "name" : "Bob Lied",
+               "drilldown" : "Bob Lied"
+            },
+            {
+               "name" : "Dave Jacoby",
+               "y" : 2,
+               "drilldown" : "Dave Jacoby"
+            },
+            {
+               "drilldown" : "David Ferrone",
+               "y" : 2,
+               "name" : "David Ferrone"
+            },
+            {
+               "name" : "E. Choroba",
+               "y" : 2,
+               "drilldown" : "E. Choroba"
+            },
+            {
+               "drilldown" : "Jaldhar H. Vyas",
+               "name" : "Jaldhar H. Vyas",
+               "y" : 5
+            },
+            {
+               "y" : 2,
+               "name" : "Jan Krnavek",
+               "drilldown" : "Jan Krnavek"
+            },
+            {
+               "drilldown" : "Jorg Sommrey",
+               "y" : 3,
+               "name" : "Jorg Sommrey"
+            },
+            {
+               "name" : "Lubos Kolouch",
+               "y" : 2,
+               "drilldown" : "Lubos Kolouch"
+            },
+            {
+               "drilldown" : "Mark Anderson",
+               "name" : "Mark Anderson",
+               "y" : 2
+            },
+            {
+               "drilldown" : "Matthias Muth",
+               "name" : "Matthias Muth",
+               "y" : 3
+            },
+            {
+               "drilldown" : "Peter Campbell Smith",
+               "y" : 3,
+               "name" : "Peter Campbell Smith"
+            },
+            {
+               "y" : 2,
+               "name" : "Peter Meszaros",
+               "drilldown" : "Peter Meszaros"
+            },
+            {
+               "name" : "Robbie Hatley",
+               "y" : 3,
+               "drilldown" : "Robbie Hatley"
+            },
+            {
+               "name" : "Robert Ransbottom",
+               "y" : 2,
+               "drilldown" : "Robert Ransbottom"
+            },
+            {
+               "y" : 5,
+               "name" : "Roger Bell_West",
+               "drilldown" : "Roger Bell_West"
+            },
+            {
+               "name" : "Simon Green",
+               "y" : 3,
+               "drilldown" : "Simon Green"
+            },
+            {
+               "name" : "Steven Wilson",
+               "y" : 2,
+               "drilldown" : "Steven Wilson"
+            },
+            {
+               "drilldown" : "Thomas Kohler",
+               "name" : "Thomas Kohler",
+               "y" : 4
+            },
+            {
+               "drilldown" : "Ulrich Rieke",
+               "name" : "Ulrich Rieke",
+               "y" : 4
+            },
+            {
+               "name" : "W. Luis Mochan",
+               "y" : 3,
+               "drilldown" : "W. Luis Mochan"
+            },
+            {
+               "y" : 2,
+               "name" : "Wanderdoc",
+               "drilldown" : "Wanderdoc"
+            }
+         ],
+         "colorByPoint" : 1
+      }
+   ],
+   "xAxis" : {
+      "type" : "category"
+   },
+   "chart" : {
+      "type" : "column"
+   },
+   "legend" : {
+      "enabled" : 0
+   },
+   "subtitle" : {
+      "text" : "[Champions: 26] Last updated at 2025-02-12 18:32:44 GMT"
    }
 }
diff --git a/stats/pwc-current.json b/stats/pwc-current.json
index 980ce16702..644cac123a 100644
--- a/stats/pwc-current.json
+++ b/stats/pwc-current.json
@@ -1,96 +1,112 @@
 {
+   "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: 16] Last updated at 2025-02-12 18:32:47 GMT"
+   },
+   "chart" : {
+      "type" : "column"
+   },
    "series" : [
       {
-         "colorByPoint" : 1,
          "name" : "The Weekly Challenge - 308",
+         "colorByPoint" : 1,
          "data" : [
             {
+               "y" : 3,
                "name" : "Ali Moradi",
-               "drilldown" : "Ali Moradi",
-               "y" : 3
+               "drilldown" : "Ali Moradi"
+            },
+            {
+               "drilldown" : "Andreas Mahnke",
+               "name" : "Andreas Mahnke",
+               "y" : 2
             },
             {
+               "drilldown" : "David Ferrone",
                "name" : "David Ferrone",
-               "y" : 2,
-               "drilldown" : "David Ferrone"
+               "y" : 2
             },
             {
-               "y" : 2,
                "drilldown" : "E. Choroba",
+               "y" : 2,
                "name" : "E. Choroba"
             },
             {
-               "name" : "Mark Anderson",
-               "drilldown" : "Mark Anderson",
-               "y" : 2
+               "name" : "Lubos Kolouch",
+               "y" : 2,
+               "drilldown" : "Lubos Kolouch"
             },
             {
                "y" : 2,
+               "name" : "Mark Anderson",
+               "drilldown" : "Mark Anderson"
+            },
+            {
                "drilldown" : "Niels van Dijke",
-               "name" : "Niels van Dijke"
+               "name" : "Niels van Dijke",
+               "y" : 2
+            },
+            {
+               "drilldown" : "Peter Campbell Smith",
+               "y" : 3,
+               "name" : "Peter Campbell Smith"
             },
             {
                "name" : "Peter Meszaros",
-               "drilldown" : "Peter Meszaros",
-               "y" : 2
+               "y" : 2,
+               "drilldown" : "Peter Meszaros"
+            },
+            {
+               "y" : 3,
+               "name" : "Robbie Hatley",
+               "drilldown" : "Robbie Hatley"
+            },
+            {
+               "y" : 3,
+               "name" : "Robert McIntosh",
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