From 9cce6277b8040b83b625c71cb321bd712122b48c Mon Sep 17 00:00:00 2001
From: Adam Russell <adamcrussell@outlook.com>
Date: Sat, 19 Apr 2025 21:40:51 -0400
Subject: initial commit

---
 challenge-317/adam-russell/blog.txt      |  1 +
 challenge-317/adam-russell/blog1.txt     |  1 +
 challenge-317/adam-russell/perl/ch-1.pl  | 21 ++++++++++++++++++++
 challenge-317/adam-russell/perl/ch-2.pl  | 33 ++++++++++++++++++++++++++++++++
 challenge-317/adam-russell/prolog/ch-1.p |  6 ++++++
 challenge-317/adam-russell/prolog/ch-2.p | 15 +++++++++++++++
 6 files changed, 77 insertions(+)
 create mode 100644 challenge-317/adam-russell/blog.txt
 create mode 100644 challenge-317/adam-russell/blog1.txt
 create mode 100644 challenge-317/adam-russell/perl/ch-1.pl
 create mode 100644 challenge-317/adam-russell/perl/ch-2.pl
 create mode 100644 challenge-317/adam-russell/prolog/ch-1.p
 create mode 100644 challenge-317/adam-russell/prolog/ch-2.p

diff --git a/challenge-317/adam-russell/blog.txt b/challenge-317/adam-russell/blog.txt
new file mode 100644
index 0000000000..0c142385b1
--- /dev/null
+++ b/challenge-317/adam-russell/blog.txt
@@ -0,0 +1 @@
+http://www.rabbitfarm.com/cgi-bin/blosxom/perl/2025/04/17
diff --git a/challenge-317/adam-russell/blog1.txt b/challenge-317/adam-russell/blog1.txt
new file mode 100644
index 0000000000..9a0384c566
--- /dev/null
+++ b/challenge-317/adam-russell/blog1.txt
@@ -0,0 +1 @@
+http://www.rabbitfarm.com/cgi-bin/blosxom/prolog/2025/04/19
diff --git a/challenge-317/adam-russell/perl/ch-1.pl b/challenge-317/adam-russell/perl/ch-1.pl
new file mode 100644
index 0000000000..eea23513d6
--- /dev/null
+++ b/challenge-317/adam-russell/perl/ch-1.pl
@@ -0,0 +1,21 @@
+
+  
+use v5.40; 
+
+  
+  sub acronyms{
+      my($word_list, $word) = @_;
+      my @first_letters = map{
+          (split //, $_)[0]
+      } @{$word_list};
+      return 1 if $word eq join q//, @first_letters;
+      return 0;
+  }
+
+  
+MAIN:{
+  say acronyms([qw/Perl Weekly Challenge/], q/PWC/);
+  say acronyms([qw/Bob Charlie Joe/], q/BCJ/);
+  say acronyms([qw/Morning Good/], q/MM/);
+}
+
diff --git a/challenge-317/adam-russell/perl/ch-2.pl b/challenge-317/adam-russell/perl/ch-2.pl
new file mode 100644
index 0000000000..220ee69357
--- /dev/null
+++ b/challenge-317/adam-russell/perl/ch-2.pl
@@ -0,0 +1,33 @@
+
+  
+use v5.40; 
+
+  sub friendly{
+      my($u, $v) = @_;
+      
+  my $differences = [];
+  my @u = split //, $u; 
+  my @v = split //, $v;
+  {
+      my $u_ = pop @u;
+      my $v_ = pop @v;
+      push @{$differences}, [$u_, $v_] unless $u_ eq $v_;
+      redo unless !@u || !@v;
+  }
+
+      
+  return 1 if @{$differences} == 0; 
+  return 0 if @{$differences} == 1 || @{$differences} > 2;    
+  my @s = sort {$a cmp $b} @{$differences->[0]}; 
+  my @t = sort {$a cmp $b} @{$differences->[1]};
+  return 1 if $s[0] eq $t[0] && $s[1] eq $t[1];
+  return 0;       
+
+  }
+  
+MAIN:{
+  say friendly q/desc/, q/dsec/;
+  say friendly q/cat/, q/dog/;
+  say friendly q/stripe/, q/sprite/;
+}
+
diff --git a/challenge-317/adam-russell/prolog/ch-1.p b/challenge-317/adam-russell/prolog/ch-1.p
new file mode 100644
index 0000000000..9bf7f11171
--- /dev/null
+++ b/challenge-317/adam-russell/prolog/ch-1.p
@@ -0,0 +1,6 @@
+
+  
+  acronym(Words, Word):-
+      maplist(nth(1), Words, FirstLetters),
+      Word = FirstLetters.
+ 
diff --git a/challenge-317/adam-russell/prolog/ch-2.p b/challenge-317/adam-russell/prolog/ch-2.p
new file mode 100644
index 0000000000..3e54e3a36b
--- /dev/null
+++ b/challenge-317/adam-russell/prolog/ch-2.p
@@ -0,0 +1,15 @@
+
+  
+  friendly(Word1, Word2):-
+      subtract(Word1, Word2, []),
+      length(Word1, Length),
+      findall(Difference, (
+          between(1, Length, I),
+          nth(I, Word1, C1),
+          nth(I, Word2, C2),
+          \+ C1 = C2,
+          Difference = [C1, C2]
+      ), Differences),
+      length(Differences, NumberDifferences),
+      NumberDifferences == 2.
+
-- 
cgit