D13231123313133313132233132312132313233313233313223313232212131   >>    D1323112331313331313223313231213231323331323331322331323221213   <<    D13231123313133313132233132312132313233313233313223313232212133   >>      D13231123313133313132233132312132313233313233313223313232212132   >>