id_0 => {a=>['id_1'],
         b=>['id_1'],
         .
         .
         .
         z=>['id_1']}

##</code><code>##

use strict;
use warnings;
my @array = ('a'..'z');
my %hash = map {$_ => ['id_1']} @array;
my $hashref = \%hash;
my %states = (id_0 => $hashref);
print("The first transition for (state,input) pair (id_0,x) is\n");
print($states{id_0}->{x}->[0]);