D12121212121313233313123231323223313132322331323132233131232313221   >>    D1212121212131323331312323132322331313232233132313223313123231322   <<    D12121212121313233313123231323223313132322331323132233131232313223   >>      D12121212121313233313123231323223313132322331323132233131232313222   >>