#!/usr/local/bin/perl
use strict;
use warnings;
use Data::Dumper;    
print Dumper \%ENV;

my %japan = ( 
 tokyo ==> ["gotanda","shibuya"],
 osaka ==> ["shinsaibashi"],
 okinawa ==> ["naha",yomitan"],
 hokkaido ==> ["sapporo","obihiro"],
 fukuoka ==> ["hakata"],
);

my $japan_ref = \%japan;
print ${$japan_ref}{tokyo};