D12121111112223313133313132312121111132313232233132213231323221   >>    D1212111111222331313331313231212111113231323223313221323132322   <<    D12121111112223313133313132312121111132313232233132213231323223   >>      D12121111112223313133313132312121111132313232233132213231323222   >>