#!/usr/bin/perl

my %h = (
word1 =>[2,3],
word2 =>[1,3],
word3 =>[1,2]
);
$h{word1} = [ $h{word2},$h{word3}]; # [[1,3],[1,2]]
$h{word2} = [ $h{word1},$h{word3}]; # [[[1,3],[1,2]],[1,2]]
$h{word3} = [ $h{word1},$h{word2}]; # [[[1,3],[1,2]],[[[1,3],[1,2]],[1,2]]]

print @{ @{ $h{'word3'} }[0] }[0], "\n";


##</code><code>##

print @{ @{ $h{'word3'} }[0] }[0]->[0], "\n"; # prints "1"
print @{ @{ $h{'word3'} }[0] }[0]->[1], "\n"; # prints "3"