D12121212121313233313123231323223313231323331323132333132313231323221221   >>    D1212121212131323331312323132322331323132333132313233313231323132322122   <<    D12121212121313233313123231323223313231323331323132333132313231323221223   >>      D12121212121313233313123231323223313231323331323132333132313231323221222   >>