D12121212121313233313123231323223313132322331323132233131323132322121   >>    D1212121212131323331312323132322331313232233132313223313132313232212   <<    D12121212121313233313123231323223313132322331323132233131323132322123   >>      D12121212121313233313123231323223313132322331323132233131323132322122   >>