- Added solutions by Colin Crain.

14 files changed, 1041 insertions, 815 deletions

diff --git a/challenge-023/colin-crain/README b/challenge-023/colin-crain/README
new file mode 100644
index 0000000000..2a5d87e97d
--- /dev/null
+++ b/challenge-023/colin-crain/README
@@ -0,0 +1 @@
+Solutions by Colin Crain.
diff --git a/challenge-023/colin-crain/perl5/ch-1.pl b/challenge-023/colin-crain/perl5/ch-1.pl
new file mode 100644
index 0000000000..b7cc06e831
--- /dev/null
+++ b/challenge-023/colin-crain/perl5/ch-1.pl
@@ -0,0 +1,58 @@
+#! /opt/local/bin/perl
+#
+#       nth_order_forward_difference.pl
+#
+#       prints nth order forward difference series.
+#
+#       usage - first argument order depth of difference
+#       further arguments represent the series to be evaluated
+#       example: 2 5 9 2 8 1 7  will produce the 2nd order difference on the sequence (5, 9, 2, 8, 1, 7)
+}
+#
+#       2019 colin crain
+## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ##
+
+use warnings;
+use strict;
+use feature ":5.26";
+
+## ## ## ## ## MAIN
+
+my ($depth, @series)  = @ARGV;
+
+if (! $depth) {
+    die "usage - first argument order depth of difference\n",
+        "further arguments represent the series to be evaluated\n",
+        "example: 2 5 9 2 8 1 7  will produce the 2nd order difference on the sequence (5, 9, 2, 8, 1, 7)\n";
+}
+
+if (scalar @series - 1 < $depth) {
+    die "cannot compute depth $depth difference series:\n",
+        "insufficient elements in series \(",
+        (join ', ', @series), "\)\n";
+}
+
+while ($depth) {
+
+    my @differences = ();
+
+## uncomment to produce a nice verbose representation of intermediate states
+#   my $format  = join ', ', map {"%6d"} @series;
+#   printf "$format\n", @series;
+
+    ## ratchet through the list creating a new list of differences between
+    ## an element and the next forward
+    while (scalar @series > 1) {
+        my $first = shift @series;
+        my $second = $series[0];
+        push @differences, ($second - $first);
+    }
+
+    $depth--;
+    @series = @differences;
+
+}
+
+say  (join ', ', @series);
+
+
diff --git a/challenge-023/colin-crain/perl5/ch-2.pl b/challenge-023/colin-crain/perl5/ch-2.pl
new file mode 100644
index 0000000000..c30ceb9625
--- /dev/null
+++ b/challenge-023/colin-crain/perl5/ch-2.pl
@@ -0,0 +1,74 @@
+#! /opt/local/bin/perl
+#
+#       prime_decomposition.pl
+#
+#       prints Prime Decomposition of a given number, given as an argument
+#
+#
+#       2019 colin crain
+## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ##
+
+
+
+use warnings;
+use strict;
+use feature ":5.26";
+
+## ## ## ## ## MAIN
+
+my $target = shift @ARGV;
+my @decomp = decompose( $target );
+say (join ', ', @decomp);
+
+## ## ## ## ## SUBS
+
+sub decompose {
+## given a number,
+## returns an array list of prime decomposition factors of the number
+    my $num = shift;
+    my @decomp;
+    my $prime = 2;
+    my $primelist = [$prime];
+
+    while ( $prime <= $num ) {
+        while ($num % $prime == 0) {
+            $num = $num / $prime;
+            push @decomp, $prime;
+        }
+        $prime = get_next_prime($primelist);
+    }
+
+    return @decomp;
+
+}
+
+sub get_next_prime {
+## given a listref of all primes up until a certain point,
+## adds next prime to the list and returns the prime
+
+    my $primelist = shift;
+
+    ## assign the last prime recorded + 1 as the new candidate
+    my $candidate = $primelist->[scalar $primelist->@* - 1] + 1;
+
+    ## index through the prime list checking for divisability; if found
+    ## augment and restart the test.
+    ## if the test value exceeds the squareroot of the candidate, the candidate
+    ## is prime. Put it on the list and return the candidate.
+    ## yes it's an infinite loop but there will always be another prime, right?
+    ## right?
+    for (my $i = 0; my $test = $primelist->[$i]; $i++) {
+        my $root = int(sqrt($candidate));
+        if ($test > $root) {
+            push $primelist->@*, $candidate;
+            return $candidate;
+        }
+
+        if ($candidate % $test == 0) {
+            $i = -1;
+            $candidate++;
+            next;
+        }
+    }
+
+}
diff --git a/challenge-023/colin-crain/perl5/ch-3.pl b/challenge-023/colin-crain/perl5/ch-3.pl
new file mode 100644
index 0000000000..9080a38838
--- /dev/null
+++ b/challenge-023/colin-crain/perl5/ch-3.pl
@@ -0,0 +1,69 @@
+#! /opt/local/bin/perl
+#
+#       poem_api_2.pl
+#
+#       access the random poem api at https://www.poemist.com/api/v1/randompoems
+#       decode the JSON and print to STDOUT
+#
+#       2019 colin crain
+## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ##
+
+use LWP::UserAgent;
+use JSON::XS qw( decode_json );
+
+use warnings;
+use strict;
+use diagnostics;
+use feature ":5.26";
+
+binmode STDOUT, ':utf8';
+
+## ## ## ## ## MAIN
+
+## Create a user agent object
+my $ua = LWP::UserAgent->new(
+    ssl_opts => {
+        verify_hostname => 1,
+    }
+);
+$ua->agent("random_poem_api/1.0");
+
+## Create a request
+my $req = HTTP::Request->new( GET => 'https://www.poemist.com/api/v1/randompoems' );
+$req->header( 'Accept' => 'application/json');
+
+## Pass request to the user agent and get a response back
+my $res = $ua->request($req);
+
+## Check the outcome of the response
+if (! $res->is_success) {
+    die "there was bad response: ", $res->status_line, "\n";
+}
+
+## decode the JSON data
+my $data = decode_json $res->content;
+
+## the decoded data is an array ref of hash refs, each with keys:
+##      {content}
+##      {title}
+##      {url}
+##      {poet}->{name}
+##      {poet}->{url}
+
+## output to STDOUT
+foreach my $poem ( $data->@* ) {
+    ## there are weird database glitches that need to be worked around
+    ## rarely some poems appear to have no content, or no title. Some Arabic poems in particular.
+    ## Rather than fail we'll simply silently skip these.
+    next if ( ! $poem->{title} || ! $poem->{poet}->{name} || ! $poem->{content} || ! $poem->{url}  );
+
+    say $poem->{title};
+    say "by $poem->{poet}->{name}";
+    say "";
+    say $poem->{content};
+    say "";
+    say "url: ", $poem->{url};
+    say "\n----------\n";
+}
+
+
diff --git a/members.json b/members.json
index 495ea73d0f..ec92204f0c 100644
--- a/members.json
+++ b/members.json
@@ -17,6 +17,7 @@
     "bob-kleemann"          : "Bob Kleemann",
     "bruno-ramos"           : "Bruno Ramos",
     "cliveholloway"         : "Clive Holloway",
+    "colin-crain"           : "Colin Crain",
     "daniel-mantovani"      : "Daniel Mantovani",
     "daniel-mita"           : "Daniel Mita",
     "dave-cross"            : "Dave Cross",
diff --git a/stats/pwc-current.json b/stats/pwc-current.json
index 71820aca9b..1ac5d94b01 100644
--- a/stats/pwc-current.json
+++ b/stats/pwc-current.json
@@ -4,48 +4,20 @@
          "text" : "Total Solutions"
       }
    },
-   "tooltip" : {
-      "followPointer" : 1,
-      "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/>"
-   },
-   "title" : {
-      "text" : "Perl Weekly Challenge - 023"
-   },
-   "legend" : {
-      "enabled" : 0
-   },
-   "plotOptions" : {
-      "series" : {
-         "borderWidth" : 0,
-         "dataLabels" : {
-            "format" : "{point.y}",
-            "enabled" : 1
-         }
-      }
-   },
-   "subtitle" : {
-      "text" : "[Champions: 18] Last updated at 2019-09-01 08:53:42 GMT"
-   },
-   "xAxis" : {
-      "type" : "category"
-   },
-   "chart" : {
-      "type" : "column"
-   },
    "drilldown" : {
       "series" : [
          {
-            "name" : "Andrezgz",
+            "id" : "Andrezgz",
             "data" : [
                [
                   "Perl 5",
                   3
                ]
             ],
-            "id" : "Andrezgz"
+            "name" : "Andrezgz"
          },
          {
+            "id" : "Arne Sommer",
             "data" : [
                [
                   "Perl 5",
@@ -60,28 +32,37 @@
                   1
                ]
             ],
-            "name" : "Arne Sommer",
-            "id" : "Arne Sommer"
+            "name" : "Arne Sommer"
          },
          {
+            "id" : "Colin Crain",
+            "data" : [
+               [
+                  "Perl 5",
+                  3
+               ]
+            ],
+            "name" : "Colin Crain"
+         },
+         {
+            "id" : "Daniel Mantovani",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
             ],
-            "name" : "Daniel Mantovani",
-            "id" : "Daniel Mantovani"
+            "name" : "Daniel Mantovani"
          },
          {
-            "id" : "Duane Powell",
+            "name" : "Duane Powell",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
             ],
-            "name" : "Duane Powell"
+            "id" : "Duane Powell"
          },
          {
             "data" : [
@@ -94,22 +75,21 @@
                   1
                ]
             ],
-            "name" : "E. Choroba",
-            "id" : "E. Choroba"
+            "id" : "E. Choroba",
+            "name" : "E. Choroba"
          },
          {
+            "name" : "Guillermo Ramos",
             "id" : "Guillermo Ramos",
             "data" : [
                [
                   "Perl 5",
                   3
                ]
-            ],
-            "name" : "Guillermo Ramos"
+            ]
          },
          {
             "id" : "Joelle Maslak",
-            "name" : "Joelle Maslak",
             "data" : [
                [
                   "Perl 5",
@@ -119,17 +99,18 @@
                   "Perl 6",
                   3
                ]
-            ]
+            ],
+            "name" : "Joelle Maslak"
          },
          {
             "id" : "Kevin Colyer",
-            "name" : "Kevin Colyer",
             "data" : [
                [
                   "Perl 6",
                   2
                ]
-            ]
+            ],
+            "name" : "Kevin Colyer"
          },
          {
             "name" : "Laurent Rosenfeld",
@@ -151,25 +132,27 @@
          },
          {
             "name" : "Mark Anderson",
+            "id" : "Mark Anderson",
             "data" : [
                [
                   "Perl 5",
                   3
                ]
-            ],
-            "id" : "Mark Anderson"
+            ]
          },
          {
-            "id" : "Noud",
             "name" : "Noud",
             "data" : [
                [
                   "Perl 6",
                   2
                ]
-            ]
+            ],
+            "id" : "Noud"
          },
          {
+            "name" : "Randy Lauen",
+            "id" : "Randy Lauen",
             "data" : [
                [
                   "Perl 5",
@@ -179,13 +162,9 @@
                   "Perl 6",
                   3
                ]
-            ],
-            "name" : "Randy Lauen",
-            "id" : "Randy Lauen"
+            ]
          },
          {
-            "id" : "Roger Bell West",
-            "name" : "Roger Bell West",
             "data" : [
                [
                   "Perl 5",
@@ -199,7 +178,9 @@
                   "Blog",
                   1
                ]
-            ]
+            ],
+            "id" : "Roger Bell West",
+            "name" : "Roger Bell West"
          },
          {
             "data" : [
@@ -212,18 +193,18 @@
                   2
                ]
             ],
-            "name" : "Ruben Westerberg",
-            "id" : "Ruben Westerberg"
+            "id" : "Ruben Westerberg",
+            "name" : "Ruben Westerberg"
          },
          {
+            "name" : "Simon Proctor",
+            "id" : "Simon Proctor",
             "data" : [
                [
                   "Perl 6",
                   2
                ]
-            ],
-            "name" : "Simon Proctor",
-            "id" : "Simon Proctor"
+            ]
          },
          {
             "id" : "Steven Wilson",
@@ -260,20 +241,23 @@
                   1
                ]
             ],
-            "name" : "Yet Ebreo",
-            "id" : "Yet Ebreo"
+            "id" : "Yet Ebreo",
+            "name" : "Yet Ebreo"
          }
       ]
    },
+   "xAxis" : {
+      "type" : "category"
+   },
    "series" : [
       {
-         "colorByPoint" : 1,
          "name" : "Perl Weekly Challenge - 023",
+         "colorByPoint" : 1,
          "data" : [
             {
+               "name" : "Andrezgz",
                "drilldown" : "Andrezgz",
-               "y" : 3,
-               "name" : "Andrezgz"
+               "y" : 3
             },
             {
                "drilldown" : "Arne Sommer",
@@ -281,6 +265,11 @@
                "name" : "Arne Sommer"
             },
             {
+               "name" : "Colin Crain",
+               "y" : 3,
+               "drilldown" : "Colin Crain"
+            },
+            {
                "y" : 2,
                "drilldown" : "Daniel Mantovani",
                "name" : "Daniel Mantovani"
@@ -296,9 +285,9 @@
                "name" : "E. Choroba"
             },
             {
-               "name" : "Guillermo Ramos",
                "drilldown" : "Guillermo Ramos",
-               "y" : 3
+               "y" : 3,
+               "name" : "Guillermo Ramos"
             },
             {
                "name" : "Joelle Maslak",
@@ -306,9 +295,9 @@
                "drilldown" : "Joelle Maslak"
             },
             {
-               "y" : 2,
+               "name" : "Kevin Colyer",
                "drilldown" : "Kevin Colyer",
-               "name" : "Kevin Colyer"
+               "y" : 2
             },
             {
                "drilldown" : "Laurent Rosenfeld",
@@ -316,13 +305,13 @@
                "name" : "Laurent Rosenfeld"
             },
             {
-               "name" : "Mark Anderson",
+               "drilldown" : "Mark Anderson",
                "y" : 3,
-               "drilldown" : "Mark Anderson"
+               "name" : "Mark Anderson"
             },
             {
-               "y" : 2,
                "drilldown" : "Noud",
+               "y" : 2,
                "name" : "Noud"
             },
             {
@@ -336,9 +325,9 @@
                "name" : "Roger Bell West"
             },
             {
+               "name" : "Ruben Westerberg",
                "y" : 4,
-               "drilldown" : "Ruben Westerberg",
-               "name" : "Ruben Westerberg"
+               "drilldown" : "Ruben Westerberg"
             },
             {
                "drilldown" : "Simon Proctor",
@@ -346,21 +335,47 @@
                "name" : "Simon Proctor"
             },
             {
-               "y" : 1,
                "drilldown" : "Steven Wilson",
+               "y" : 1,
                "name" : "Steven Wilson"
             },
             {
-               "name" : "Walt Mankowski",
                "drilldown" : "Walt Mankowski",
-               "y" : 2
+               "y" : 2,
+               "name" : "Walt Mankowski"
             },
             {
+               "name" : "Yet Ebreo",
                "y" : 7,
-               "drilldown" : "Yet Ebreo",
-               "name" : "Yet Ebreo"
+               "drilldown" : "Yet Ebreo"
             }
          ]
       }
-   ]
+   ],
+   "chart" : {
+      "type" : "column"
+   },
+   "plotOptions" : {
+      "series" : {
+         "dataLabels" : {
+            "enabled" : 1,
+            "format" : "{point.y}"
+         },
+         "borderWidth" : 0
+      }
+   },
+   "subtitle" : {
+      "text" : "[Champions: 19] Last updated at 2019-09-01 09:11:19 GMT"
+   },
+   "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/>"
+   },
+   "legend" : {
+      "enabled" : 0
+   },
+   "title" : {
+      "text" : "Perl Weekly Challenge - 023"
+   }
 }
diff --git a/stats/pwc-language-breakdown-summary.json b/stats/pwc-language-breakdown-summary.json
index 0855ded770..c9b48ba0ef 100644
--- a/stats/pwc-language-breakdown-summary.json
+++ b/stats/pwc-language-breakdown-summary.json
@@ -1,6 +1,40 @@
 {
+   "chart" : {
+      "type" : "column"
+   },
+   "tooltip" : {
+      "pointFormat" : "<b>{point.y:.0f}</b>"
+   },
+   "subtitle" : {
+      "text" : "Last updated at 2019-09-01 09:11:35 GMT"
+   },
+   "xAxis" : {
+      "labels" : {
+         "style" : {
+            "fontFamily" : "Verdana, sans-serif",
+            "fontSize" : "13px"
+         }
+      },
+      "type" : "category"
+   },
+   "title" : {
+      "text" : "Perl Weekly Challenge Contributions - 2019"
+   },
    "series" : [
       {
+         "dataLabels" : {
+            "enabled" : "true",
+            "style" : {
+               "fontSize" : "13px",
+               "fontFamily" : "Verdana, sans-serif"
+            },
+            "format" : "{point.y:.0f}",
+            "align" : "right",
+            "color" : "#FFFFFF",
+            "y" : 10,
+            "rotation" : -90
+         },
+         "name" : "Contributions",
          "data" : [
             [
                "Blog",
@@ -8,56 +42,22 @@
             ],
             [
                "Perl 5",
-               956
+               959
             ],
             [
                "Perl 6",
                576
             ]
-         ],
-         "dataLabels" : {
-            "align" : "right",
-            "y" : 10,
-            "rotation" : -90,
-            "color" : "#FFFFFF",
-            "style" : {
-               "fontFamily" : "Verdana, sans-serif",
-               "fontSize" : "13px"
-            },
-            "format" : "{point.y:.0f}",
-            "enabled" : "true"
-         },
-         "name" : "Contributions"
+         ]
       }
    ],
-   "title" : {
-      "text" : "Perl Weekly Challenge Contributions - 2019"
-   },
-   "subtitle" : {
-      "text" : "Last updated at 2019-09-01 08:54:22 GMT"
-   },
-   "tooltip" : {
-      "pointFormat" : "<b>{point.y:.0f}</b>"
-   },
    "legend" : {
       "enabled" : "false"
    },
-   "xAxis" : {
-      "type" : "category",
-      "labels" : {
-         "style" : {
-            "fontFamily" : "Verdana, sans-serif",
-            "fontSize" : "13px"
-         }
-      }
-   },
    "yAxis" : {
       "title" : {
          "text" : null
       },
       "min" : 0
-   },
-   "chart" : {
-      "type" : "column"
    }
 }
diff --git a/stats/pwc-language-breakdown.json b/stats/pwc-language-breakdown.json
index f77c42105c..98dc20843f 100644
--- a/stats/pwc-language-breakdown.json
+++ b/stats/pwc-language-breakdown.json
@@ -1,137 +1,31 @@
 {
-   "series" : [
-      {
-         "colorByPoint" : "true",
-         "name" : "Perl Weekly Challenge Languages",
-         "data" : [
-            {
-               "name" : "#001",
-               "drilldown" : "001",
-               "y" : 132
-            },
-            {
-               "name" : "#002",
-               "drilldown" : "002",
-               "y" : 104
-            },
-            {
-               "name" : "#003",
-               "y" : 66,
-               "drilldown" : "003"
-            },
-            {
-               "y" : 86,
-               "drilldown" : "004",
-               "name" : "#004"
-            },
-            {
-               "name" : "#005",
-               "drilldown" : "005",
-               "y" : 66
-            },
-            {
-               "y" : 47,
-               "drilldown" : "006",
-               "name" : "#006"
-            },
-            {
-               "y" : 55,
-               "drilldown" : "007",
-               "name" : "#007"
-            },
-            {
-               "name" : "#008",
-               "drilldown" : "008",
-               "y" : 68
-            },
-            {
-               "name" : "#009",
-               "drilldown" : "009",
-               "y" : 66
-            },
-            {
-               "drilldown" : "010",
-               "y" : 59,
-               "name" : "#010"
-            },
-            {
-               "y" : 78,
-               "drilldown" : "011",
-               "name" : "#011"
-            },
-            {
-               "name" : "#012",
-               "y" : 82,
-               "drilldown" : "012"
-            },
-            {
-               "name" : "#013",
-               "y" : 75,
-               "drilldown" : "013"
-            },
-            {
-               "drilldown" : "014",
-               "y" : 95,
-               "name" : "#014"
-            },
-            {
-               "name" : "#015",
-               "drilldown" : "015",
-               "y" : 91
-            },
-            {
-               "name" : "#016",
-               "drilldown" : "016",
-               "y" : 65
-            },
-            {
-               "name" : "#017",
-               "drilldown" : "017",
-               "y" : 78
-            },
-            {
-               "name" : "#018",
-               "y" : 76,
-               "drilldown" : "018"
-            },
-            {
-               "y" : 95,
-               "drilldown" : "019",
-               "name" : "#019"
-            },
-            {
-               "y" : 95,
-               "drilldown" : "020",
-               "name" : "#020"
-            },
-            {
-               "name" : "#021",
-               "drilldown" : "021",
-               "y" : 66
-            },
-            {
-               "y" : 60,
-               "drilldown" : "022",
-               "name" : "#022"
-            },
-            {
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-               "y" : 63,
-               "name" : "#023"
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-   ],
    "subtitle" : {
-      "text" : "Click the columns to drilldown the language breakdown. Last updated at 2019-09-01 08:54:22 GMT"
+      "text" : "Click the columns to drilldown the language breakdown. Last updated at 2019-09-01 09:11:35 GMT"
    },
    "tooltip" : {
+      "pointFormat" : "<span style=\"color:{point.color}\">Challenge {point.name}</span>: <b>{point.y:f}</b><br/>",
       "headerFormat" : "<span style=\"font-size:11px\"></span>",
-      "followPointer" : "true",
-      "pointFormat" : "<span style=\"color:{point.color}\">Challenge {point.name}</span>: <b>{point.y:f}</b><br/>"
+      "followPointer" : "true"
    },
-   "title" : {
-      "text" : "Perl Weekly Challenge Language"
+   "chart" : {
+      "type" : "column"
+   },
+   "plotOptions" : {
+      "series" : {
+         "borderWidth" : 0,
+         "dataLabels" : {
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+            "enabled" : 1
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+   "yAxis" : {
+      "title" : {
+         "text" : "Total Solutions"
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+   "legend" : {
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@@ -154,7 +48,6 @@
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@@ -169,9 +62,11 @@
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@@ -186,10 +81,10 @@
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@@ -204,10 +99,10 @@
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@@ -222,10 +117,11 @@
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@@ -239,11 +135,10 @@
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@@ -295,9 +188,11 @@
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@@ -329,9 +225,7 @@
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@@ -367,7 +260,8 @@
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@@ -388,6 +282,8 @@
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@@ -401,11 +297,10 @@
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@@ -420,10 +315,10 @@
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@@ -457,10 +351,11 @@