XEXF
      -----------
XNEXT ) MLNNLMTEM
       -NTELLE
        ======
         EEFRFT
        -LMRMMX
         ======
          MEEXLE
         -NTELLE
          ======
           FRMRRM
          -EFMRNM
           ======
            NTTNR

base: 8
symbols: EFLMNRTX
difficulty: intermediate
restrictions: no multiplication