D12121212121313233313232313231323123231323223313113313231323331323211231211   >>    D1212121212131323331323231323132312323132322331311331323132333132321123121   <<    D12121212121313233313232313231323123231323223313113313231323331323211231213   >>      D12121212121313233313232313231323123231323223313113313231323331323211231212   >>