D1212121212131323223313233231323331313232233132323132313233313131121   >>    D121212121213132322331323323132333131323223313232313231323331313112   <<    D1212121212131323223313233231323331313232233132323132313233313131123   >>      D1212121212131323223313233231323331313232233132323132313233313131122   >>