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my $arrayElement = $$arrayRef[0];
my $hashValue = $$hashRef{someKey};

my $array_element = $array_ref->[0];
my $hash_value    = $hash_ref->{some_key};

my $foo = $AoH_ref->[0]->{some_key};

my $hash_ref = $AoH_ref->[0];
my $foo      = $hash_ref->{some_key};