D12121212121313233313232313231323123231323223313113313232233132313232212121   >>    D1212121212131323331323231323132312323132322331311331323223313231323221212   <<    D12121212121313233313232313231323123231323223313113313232233132313232212123   >>      D12121212121313233313232313231323123231323223313113313232233132313232212122   >>