G'day rodinski,
Here's a possible solution.
It doesn't require loading any modules.
In the spirit of an idiom, I've greatly simplified the data:
now you can see more idiom, less geography.
#!/usr/bin/env perl
use strict;
use warnings;
my @posts = qw{a b c d};
my %fence = (
$posts[0],
(map { $_ => $_ } @posts[1..$#posts-1]),
$posts[-1]
);
print "$_ to $fence{$_}\n" for @posts[0..$#posts-1];
my @extra = qw{w x y z};
my %info;
$info{$posts[$_]}{extra} = $extra[$_] for 0..$#posts;
print "$_~$info{$_}{extra}\n" for @posts;
Output:
a to b
b to c
c to d
a~w
b~x
c~y
d~z
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