D1212121212131323223313233231323331313232233132323132313232111121   >>    D121212121213132322331323323132333131323223313232313231323211112   <<    D1212121212131323223313233231323331313232233132323132313232111123   >>      D1212121212131323223313233231323331313232233132323132313232111122   >>