- Added solutions by Laurent Rosenfeld.

29 files changed, 1974 insertions, 1806 deletions

diff --git a/challenge-173/laurent-rosenfeld/bc/ch-2.bc b/challenge-173/laurent-rosenfeld/bc/ch-2.bc
new file mode 100644
index 0000000000..b10eacbc4a
--- /dev/null
+++ b/challenge-173/laurent-rosenfeld/bc/ch-2.bc
@@ -0,0 +1,9 @@
+n = 2
+print n, "\n"
+count = 1
+while (count < 10) {
+    n = (n - 1) * n + 1
+    print n, "\n"
+    count += 1
+}
+quit
diff --git a/challenge-173/laurent-rosenfeld/blog.txt b/challenge-173/laurent-rosenfeld/blog.txt
new file mode 100644
index 0000000000..b474a60ea6
--- /dev/null
+++ b/challenge-173/laurent-rosenfeld/blog.txt
@@ -0,0 +1 @@
+http://blogs.perl.org/users/laurent_r/2022/07/perl-weekly-challenge-173-esthetic-number-and-sylvesters-sequence.html
diff --git a/challenge-173/laurent-rosenfeld/julia/ch-1.jl b/challenge-173/laurent-rosenfeld/julia/ch-1.jl
new file mode 100644
index 0000000000..063b9f4276
--- /dev/null
+++ b/challenge-173/laurent-rosenfeld/julia/ch-1.jl
@@ -0,0 +1,13 @@
+function is_esthetic(num)
+    n = string(num)
+    for i in 2:length(n)
+        if abs(n[i] - n[i-1]) != 1
+            return false
+        end
+    end
+    return true
+end
+
+for test in [5456, 120, 121, 23456, 2346, 7654567, 765467]
+    println("$test\t", is_esthetic(test) ? "Esthetic" : "Non esthetic")
+end
diff --git a/challenge-173/laurent-rosenfeld/julia/ch-2.jl b/challenge-173/laurent-rosenfeld/julia/ch-2.jl
new file mode 100644
index 0000000000..bde783e20b
--- /dev/null
+++ b/challenge-173/laurent-rosenfeld/julia/ch-2.jl
@@ -0,0 +1,6 @@
+s = BigInt(2)
+println(s)
+for i in 1:9
+    s = s * (s - 1) + 1
+    println(s)
+end
diff --git a/challenge-173/laurent-rosenfeld/perl/ch-1.pl b/challenge-173/laurent-rosenfeld/perl/ch-1.pl
new file mode 100644
index 0000000000..449f134865
--- /dev/null
+++ b/challenge-173/laurent-rosenfeld/perl/ch-1.pl
@@ -0,0 +1,14 @@
+use strict;
+use warnings;
+use feature "say";
+
+sub is_esthetic {
+    my @d = split //, shift;     # get an array of digits
+    for my $i (1..$#d) {
+        return 0 if abs($d[$i] - $d[$i -1 ]) != 1;
+    }
+    return 1;
+}
+for my $test (qw<5456 120 121 23456 2346 7654567 765467>) {
+    say sprintf("%-9d", $test), is_esthetic($test) ? "is esthetic" : "is not esthetic";
+}
diff --git a/challenge-173/laurent-rosenfeld/perl/ch-2.pl b/challenge-173/laurent-rosenfeld/perl/ch-2.pl
new file mode 100644
index 0000000000..7cedfe165d
--- /dev/null
+++ b/challenge-173/laurent-rosenfeld/perl/ch-2.pl
@@ -0,0 +1,16 @@
+use strict;
+use warnings;
+use feature "say";
+use bigint;
+
+sub prod {
+    my $prod = 1;
+    $prod *= $_ for @_;
+    return $prod;
+}
+
+my @s = (2);
+while (@s < 10) {
+    push @s, 1 + prod @s;
+}
+say for @s;
diff --git a/challenge-173/laurent-rosenfeld/python/ch-1.py b/challenge-173/laurent-rosenfeld/python/ch-1.py
new file mode 100644
index 0000000000..6711b299a8
--- /dev/null
+++ b/challenge-173/laurent-rosenfeld/python/ch-1.py
@@ -0,0 +1,12 @@
+def is_esthetic(m):
+  n = str(m)
+  for i in range(1, len(n)):
+    if abs(int(n[i]) - int(n[i - 1 ])) != 1:
+      return False
+  return True
+
+for test in [5456, 120, 121, 23456, 2346, 7654567, 765467]:
+  if is_esthetic(test):
+    print("{:<9d} is esthetic".format(test))
+  else:
+    print("{:<9d} is not esthetic".format(test))
diff --git a/challenge-173/laurent-rosenfeld/python/ch-2.py b/challenge-173/laurent-rosenfeld/python/ch-2.py
new file mode 100644
index 0000000000..7687e7a464
--- /dev/null
+++ b/challenge-173/laurent-rosenfeld/python/ch-2.py
@@ -0,0 +1,5 @@
+s = [2];
+for i in range(9):
+  s.append(s[-1] * (s[-1] - 1) + 1)
+for j in s:
+  print(j)
diff --git a/challenge-173/laurent-rosenfeld/raku/ch-1.raku b/challenge-173/laurent-rosenfeld/raku/ch-1.raku
new file mode 100644
index 0000000000..ab422ca880
--- /dev/null
+++ b/challenge-173/laurent-rosenfeld/raku/ch-1.raku
@@ -0,0 +1,8 @@
+sub is-esthetic ($n) {
+    my @d = $n.comb;     # get an array of digits
+    return False if abs(@d[$_] - @d[$_-1]) != 1 for 1..@d.end;
+    return True;
+}
+for <5456 120 121 23456 2346 7654567 765467> -> $test {
+    say $test.fmt("%-9d"), is-esthetic($test) ?? "is esthetic" !! "is not esthetic";
+}
diff --git a/challenge-173/laurent-rosenfeld/raku/ch-2.raku b/challenge-173/laurent-rosenfeld/raku/ch-2.raku
new file mode 100644
index 0000000000..a07d25bb6a
--- /dev/null
+++ b/challenge-173/laurent-rosenfeld/raku/ch-2.raku
@@ -0,0 +1,5 @@
+my @s = 2;
+while @s.elems < 10 {
+    push @s, 1 + [*] @s;
+}
+.say for @s;
diff --git a/challenge-173/laurent-rosenfeld/ring/ch-1.ring b/challenge-173/laurent-rosenfeld/ring/ch-1.ring
new file mode 100644
index 0000000000..812110474c
--- /dev/null
+++ b/challenge-173/laurent-rosenfeld/ring/ch-1.ring
@@ -0,0 +1,17 @@
+for test in [5456, 120, 121, 23456, 2346, 7654567, 765467]
+    see test
+    if is_esthetic(test)
+        see " is esthetic" + nl
+    else
+        see " is not esthetic" + nl
+    ok
+next
+
+func is_esthetic (num)
+    n = "" + num
+    for i = 2 to len(n)
+        if fabs(n[i] - n[i-1]) != 1
+            return false
+        ok
+    next
+    return true
diff --git a/challenge-173/laurent-rosenfeld/ring/ch-2.ring b/challenge-173/laurent-rosenfeld/ring/ch-2.ring
new file mode 100644
index 0000000000..b67bc2768a
--- /dev/null
+++ b/challenge-173/laurent-rosenfeld/ring/ch-2.ring
@@ -0,0 +1,6 @@
+s = 2;
+see s + nl
+for i = 1 to 9
+    s = s * (s - 1) + 1
+    see s + nl
+next
diff --git a/challenge-173/laurent-rosenfeld/ruby/ch-1.rb b/challenge-173/laurent-rosenfeld/ruby/ch-1.rb
new file mode 100644
index 0000000000..bf4d162263
--- /dev/null
+++ b/challenge-173/laurent-rosenfeld/ruby/ch-1.rb
@@ -0,0 +1,18 @@
+def is_esthetic(m)
+    n = m.to_s
+    for i in 1..(n.length - 1)
+        if (n[i].to_i - n[i-1].to_i).abs != 1
+            return false
+        end
+    end
+    return true
+end
+
+for test in [ 5456, 120, 121, 23456, 2346, 7654567, 765467]
+    printf "%-9d ", test
+    if is_esthetic(test)
+        print("is esthetic\n")
+    else
+        print("is not esthetic\n")
+    end
+end
diff --git a/challenge-173/laurent-rosenfeld/ruby/ch-2.rb b/challenge-173/laurent-rosenfeld/ruby/ch-2.rb
new file mode 100644
index 0000000000..0890b30498
--- /dev/null
+++ b/challenge-173/laurent-rosenfeld/ruby/ch-2.rb
@@ -0,0 +1,7 @@
+# Ruby automatically switches to Bignum when needed
+s = 2
+print("#{s}\n")
+for i in 1..9
+    s = s * (s - 1) + 1
+    print("#{s}\n")
+end
diff --git a/challenge-173/laurent-rosenfeld/scala/ch-2.scala b/challenge-173/laurent-rosenfeld/scala/ch-2.scala
new file mode 100644
index 0000000000..f08aee7b2b
--- /dev/null
+++ b/challenge-173/laurent-rosenfeld/scala/ch-2.scala
@@ -0,0 +1,8 @@
+object sylvester extends App {
+  var n = BigInt(2)
+  println(n)
+  for (i <- 1 to 9) {
+    n = n * (n - 1) + 1
+    println(n)
+  }
+}
diff --git a/stats/pwc-current.json b/stats/pwc-current.json
index 3d73216786..bce0231769 100644
--- a/stats/pwc-current.json
+++ b/stats/pwc-current.json
@@ -1,49 +1,28 @@
 {
-   "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
-   },
-   "yAxis" : {
-      "title" : {
-         "text" : "Total Solutions"
-      }
-   },
-   "chart" : {
-      "type" : "column"
-   },
-   "subtitle" : {
-      "text" : "[Champions: 14] Last updated at 2022-07-12 23:24:17 GMT"
-   },
-   "title" : {
-      "text" : "The Weekly Challenge - 173"
-   },
-   "legend" : {
-      "enabled" : 0
-   },
    "drilldown" : {
       "series" : [
          {
+            "name" : "Cheok-Yin Fung",
             "data" : [
                [
                   "Perl",
                   1
                ]
             ],
-            "name" : "Cheok-Yin Fung",
             "id" : "Cheok-Yin Fung"
          },
          {
+            "id" : "E. Choroba",
+            "name" : "E. Choroba",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ],
-            "name" : "E. Choroba",
-            "id" : "E. Choroba"
+            ]
          },
          {
+            "name" : "Jaldhar H. Vyas",
             "data" : [
                [
                   "Perl",
@@ -58,8 +37,7 @@
                   1
                ]
             ],
-            "id" : "Jaldhar H. Vyas",
-            "name" : "Jaldhar H. Vyas"
+            "id" : "Jaldhar H. Vyas"
          },
          {
             "id" : "James Smith",
@@ -76,6 +54,24 @@
             ]
          },
          {
+            "id" : "Laurent Rosenfeld",
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Raku",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ],
+            "name" : "Laurent Rosenfeld"
+         },
+         {
             "id" : "Luca Ferrari",
             "name" : "Luca Ferrari",
             "data" : [
@@ -90,34 +86,34 @@
             ]
          },
          {
+            "id" : "Mark Anderson",
             "data" : [
                [
                   "Raku",
                   2
                ]
             ],
-            "name" : "Mark Anderson",
-            "id" : "Mark Anderson"
+            "name" : "Mark Anderson"
          },
          {
+            "id" : "Matthew Neleigh",
             "data" : [
                [
                   "Perl",
                   2
                ]
             ],
-            "id" : "Matthew Neleigh",
             "name" : "Matthew Neleigh"
          },
          {
-            "id" : "Niels van Dijke",
             "name" : "Niels van Dijke",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ]
+            ],
+            "id" : "Niels van Dijke"
          },
          {
             "data" : [
@@ -130,42 +126,41 @@
                   1
                ]
             ],
-            "id" : "Peter Campbell Smith",
-            "name" : "Peter Campbell Smith"
+            "name" : "Peter Campbell Smith",
+            "id" : "Peter Campbell Smith"
          },
          {
+            "name" : "Philippe Bricout",
             "data" : [
                [
                   "Perl",
                   1
                ]
             ],
-            "name" : "Philippe Bricout",
             "id" : "Philippe Bricout"
          },
          {
+            "id" : "Robert Ransbottom",
+            "name" : "Robert Ransbottom",
             "data" : [
                [
                   "Raku",
                   2
                ]
-            ],
-            "name" : "Robert Ransbottom",
-            "id" : "Robert Ransbottom"
+            ]
          },
          {
+            "name" : "Simon Proctor",
             "data" : [
                [
                   "Raku",
                   2
                ]
             ],
-            "id" : "Simon Proctor",
-            "name" : "Simon Proctor"
+            "id" : "Simon Proctor"
          },
          {
             "name" : "Stephen G Lynn",
-            "id" : "Stephen G Lynn",
             "data" : [
                [
                   "Perl",
@@ -179,7 +174,8 @@
                   "Blog",
                   1
                ]
-            ]
+            ],
+            "id" : "Stephen G Lynn"
          },
          {
             "data" : [
@@ -192,26 +188,47 @@
                   1
                ]
             ],
-            "id" : "W. Luis Mochan",
-            "name" : "W. Luis Mochan"
+            "name" : "W. Luis Mochan",
+            "id" : "W. Luis Mochan"
          }
       ]
    },
+   "legend" : {
+      "enabled" : 0
+   },
+   "yAxis" : {
+      "title" : {
+         "text" : "Total Solutions"
+      }
+   },
    "plotOptions" : {
       "series" : {
+         "borderWidth" : 0,
          "dataLabels" : {
             "format" : "{point.y}",
             "enabled" : 1
-         },
-         "borderWidth" : 0
+         }
       }
    },
    "xAxis" : {
       "type" : "category"
    },
+   "chart" : {
+      "type" : "column"
+   },
+   "title" : {
+      "text" : "The Weekly Challenge - 173"
+   },
+   "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
+   },
+   "subtitle" : {
+      "text" : "[Champions: 15] Last updated at 2022-07-12 23:47:23 GMT"
+   },
    "series" : [
       {
-         "name" : "The Weekly Challenge - 173",
          "data" : [
             {
                "y" : 1,
@@ -220,13 +237,13 @@
             },
             {
                "drilldown" : "E. Choroba",
-               "name" : "E. Choroba",
-               "y" : 2
+               "y" : 2,
+               "name" : "E. Choroba"
             },
             {
-               "drilldown" : "Jaldhar H. Vyas",
+               "y" : 5,
                "name" : "Jaldhar H. Vyas",
-               "y" : 5
+               "drilldown" : "Jaldhar H. Vyas"
             },
             {
                "name" : "James Smith",
@@ -234,29 +251,34 @@
                "drilldown" : "James Smith"
             },
             {
+               "drilldown" : "Laurent Rosenfeld",
+               "y" : 5,
+               "name" : "Laurent Rosenfeld"
+            },
+            {
                "name" : "Luca Ferrari",
                "y" : 8,
                "drilldown" : "Luca Ferrari"
             },
             {
-               "name" : "Mark Anderson",
                "y" : 2,
+               "name" : "Mark Anderson",
                "drilldown" : "Mark Anderson"
             },
             {
-               "y" : 2,
+               "drilldown" : "Matthew Neleigh",
                "name" : "Matthew Neleigh",
-               "drilldown" : "Matthew Neleigh"
+               "y" : 2
             },
             {
-               "drilldown" : "Niels van Dijke",
+               "name" : "Niels van Dijke",
                "y" : 2,
-               "name" : "Niels van Dijke"
+               "drilldown" : "Niels van Dijke"
             },
             {
-               "drilldown" : "Peter Campbell Smith",
+               "y" : 3,
                "name" : "Peter Campbell Smith",
-               "y" : 3
+               "drilldown" : "Peter Campbell Smith"
             },
             {
                "drilldown" : "Philippe Bricout",
@@ -264,9 +286,9 @@
                "y" : 1
             },
             {
-               "name" : "Robert Ransbottom",
+               "drilldown" : "Robert Ransbottom",
                "y" : 2,
-               "drilldown" : "Robert Ransbottom"
+               "name" : "Robert Ransbottom"
             },
             {
                "drilldown" : "Simon Proctor",
@@ -279,11 +301,12 @@
                "name" : "Stephen G Lynn"
             },
             {
-               "drilldown" : "W. Luis Mochan",
+               "y" : 3,
                "name" : "W. Luis Mochan",
-               "y" : 3
+               "drilldown" : "W. Luis Mochan"
             }
          ],
+         "name" : "The Weekly Challenge - 173",
          "colorByPoint" : 1
       }
    ]
diff --git a/stats/pwc-language-breakdown-summary.json b/stats/pwc-language-breakdown-summary.json
index 1f24897310..730dbde996 100644
--- a/stats/pwc-language-breakdown-summary.json
+++ b/stats/pwc-language-breakdown-summary.json
@@ -1,63 +1,63 @@
 {
-   "title" : {
-      "text" : "The Weekly Challenge Contributions [2019 - 2022]"
+   "yAxis" : {
+      "min" : 0,
+      "title" : {
+         "text" : null
+      }
    },
    "legend" : {
       "enabled" : "false"
    },
-   "subtitle" : {
-      "text" : "Last updated at 2022-07-12 23:24:17 GMT"
+   "xAxis" : {
+      "labels" : {
+         "style" : {
+            "fontSize" : "13px",
+            "fontFamily" : "Verdana, sans-serif"
+         }
+      },
+      "type" : "category"
    },
    "chart" : {
       "type" : "column"
    },
-   "yAxis" : {
-      "title" : {
-         "text" : null
-      },
-      "min" : 0
-   },
    "tooltip" : {
       "pointFormat" : "<b>{point.y:.0f}</b>"
    },
+   "title" : {
+      "text" : "The Weekly Challenge Contributions [2019 - 2022]"
+   },
+   "subtitle" : {
+      "text" : "Last updated at 2022-07-12 23:47:23 GMT"
+   },
    "series" : [
       {
-         "name" : "Contributions",
          "dataLabels" : {
-            "enabled" : "true",
-            "rotation" : -90,
-            "align" : "right",
             "style" : {
                "fontFamily" : "Verdana, sans-serif",
                "fontSize" : "13px"
             },
-            "color" : "#FFFFFF",
             "format" : "{point.y:.0f}",
-            "y" : 10
+            "enabled" : "true",
+            "y" : 10,
+            "color" : "#FFFFFF",
+            "rotation" : -90,
+            "align" : "right"
          },
          "data" : [
             [
                "Blog",
-               2698
+               2699
             ],
             [
                "Perl",
-               8415
+               8417
             ],
             [
                "Raku",
-               5003
+               5005
             ]
-         ]
-      }
-   ],
-   "xAxis" : {
-      "type" : "category",
-      "labels" : {
-         "style" : {
-            "fontFamily" : "Verdana, sans-serif",
-            "fontSize" : "13px"
-         }
+         ],
+         "name" : "Contributions"
       }
-   }
+   ]
 }
diff --git a/stats/pwc-language-breakdown.json b/stats/pwc-language-breakdown.json
index e675b5d244..4e24798153 100644
--- a/stats/pwc-language-breakdown.json
+++ b/stats/pwc-language-breakdown.json
@@ -1,23 +1,893 @@
 {
-   "chart" : {
-      "type" : "column"
-   },
-   "yAxis" : {
-      "title" : {
-         "text" : "Total Solutions"
-      }
+   "title" : {
+      "text" : "The Weekly Challenge Language"
    },
    "tooltip" : {
-      "followPointer" : "true",
+      "pointFormat" : "<span style=\"color:{point.color}\">Challenge {point.name}</span>: <b>{point.y:f}</b><br/>",
       "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"
    },
-   "title" : {
-      "text" : "The Weekly Challenge Language"
+   "subtitle" : {
+      "text" : "Click the columns to drilldown the language breakdown. Last updated at 2022-07-12 23:47:23 GMT"
    },
+   "series" : [
+      {
+         "colorByPoint" : "true",
+         "name" : "The Weekly Challenge Languages",
+         "data" : [
+            {
+               "drilldown" : "001",
+               "y" : 161,
+               "name" : "#001"
+            },
+            {
+               "drilldown" : "002",
+               "y" : 125,
+               "name" : "#002"
+            },
+            {
+               "name" : "#003",
+               "y" : 83,
+               "drilldown" : "003"
+            },
+            {
+               "drilldown" : "004",
+               "name" : "#004",
+               "y" : 99
+            },
+            {
+               "drilldown" : "005",
+               "name" : "#005",
+               "y" : 78
+            },
+            {
+               "drilldown" : "006",
+               "y" : 58,
+               "name" : "#006"
+            },
+            {
+               "drilldown" : "007",
+               "y" : 65,
+               "name" : "#007"
+            },
+            {
+               "drilldown" : "008",
+               "name" : "#008",
+               "y" : 78
+            },
+            {
+               "y" : 76,
+               "name" : "#009",
+               "drilldown" : "009"
+            },
+            {
+               "y" : 65,
+               "name" : "#010",
+               "drilldown" : "010"
+            },
+            {
+               "drilldown" : "011",
+               "y" : 85,
+               "name" : "#011"
+            },
+            {
+               "name" : "#012",
+               "y" : 89,
+               "drilldown" : "012"
+            },
+            {
+               "drilldown" : "013",
+               "y" : 85,
+               "name" : "#013"
+            },
+            {
+               "drilldown" : "014",
+               "name" : "#014",
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+            },
+            {
+               "drilldown" : "015",
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+               "name" : "#015"
+            },
+            {
+               "name" : "#016",
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+               "drilldown" : "016"
+            },
+            {
+               "drilldown" : "017",
+               "name" : "#017",
+               "y" : 84
+            },
+            {
+               "name" : "#018",
+               "y" : 81,
+               "drilldown" : "018"
+            },
+            {
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+               "name" : "#019",
+               "drilldown" : "019"
+            },
+            {
+               "drilldown" : "020",
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+               "name" : "#020"
+            },
+            {
+               "name" : "#021",
+               "y" : 72,
+               "drilldown" : "021"
+            },
+            {
+               "y" : 68,
+               "name" : "#022",
+               "drilldown" : "022"
+            },
+            {
+               "drilldown" : "023",
+               "name" : "#023",
+               "y" : 97
+            },
+            {
+               "name" : "#024",
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+               "drilldown" : "024"
+            },
+            {
+               "drilldown" : "025",
+               "name" : "#025",
+               "y" : 59
+            },
+            {
+               "name" : "#026",
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+               "drilldown" : "026"
+            },
+            {
+               "name" : "#027",
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+               "drilldown" : "027"
+            },
+            {
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+               "name" : "#028",
+               "drilldown" : "028"
+            },
+            {
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+               "name" : "#029",
+               "drilldown" : "029"
+            },
+            {
+               "name" : "#030",
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+               "drilldown" : "030"
+            },
+            {
+               "drilldown" : "031",
+               "name" : "#031",
+               "y" : 91
+            },
+            {
+               "name" : "#032",
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+               "drilldown" : "032"
+            },
+            {
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+               "name" : "#033",
+               "drilldown" : "033"
+            },
+            {
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+               "name" : "#034"
+            },
+            {
+               "name" : "#035",
+               "y" : 66,
+               "drilldown" : "035"
+            },
+            {
+               "drilldown" : "036",
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+               "name" : "#036"
+            },
+            {
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+               "name" : "#037",
+               "drilldown" : "037"
+            },
+            {
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+               "name" : "#038"
+            },
+            {
+               "drilldown" : "039",
+               "y" : 64,
+               "name" : "#039"
+            },
+            {
+               "name" : "#040",
+               "y" : 75,
+               "drilldown" : "040"
+            },
+            {