D12121212121313233313232313231323123231323223313113313231232211   >>    D1212121212131323331323231323132312323132322331311331323123221   <<    D12121212121313233313232313231323123231323223313113313231232213   >>      D12121212121313233313232313231323123231323223313113313231232212   >>