%h = (
'USA' => ['Chicago', 'Washington', 'New York'],
'Germany' => ['Frankfurt', 'Berlin'],
'Finland' => ['Helsinki']
);
for $k (sort keys %h){
print "$k: @{$h{$k}}\n";
}
%h = (
'USA' => {'Chicago' => undef, 'Washington' => undef, 'New York' =>
+ undef},
'Germany' => {'Frankfurt' => undef, 'Berlin' => undef},
'Finland' => {'Helsinki' => undef}
);
for $k (sort keys %h){
print join ' ', $k, keys %{$h{$k}},"\n";
}
The first option uses hash of arrays
the second hash of hashes
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