D12121111111123313133313133313231131323132322331323132311233132211211   >>    D1212111111112331313331313331323113132313232233132313231123313221121   <<    D12121111111123313133313133313231131323132322331323132311233132211213   >>      D12121111111123313133313133313231131323132322331323132311233132211212   >>