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my %hash;
my $hashref = \%hash;
...
$hash{key2} = { key2_1 = "wakkawak!", 
                key2_2 = $hashref->{key1}{key1_1}, 
              };

my $it = ["value1_1",value1_2"];
my %hash = ( key1 => { key1_1 = $it,
...
                     },
);
my $hashref = \%hash;