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};