D12121111112223313223313132233132213231323132313131133132321121   >>    D1212111111222331322331313223313221323132313231313113313232112   <<    D12121111112223313223313132233132213231323132313131133132321123   >>      D12121111112223313223313132233132213231323132313131133132321122   >>