PPM
      ----------
QTAFQ ) TQFYAAMY
       -TWFQQW
        ======
         TAATFM
        -TWFQQW
         ======
          FMPMAY
         -FTQYYT
          ======
           PFQPW

base: 9
symbols: AEFMPQTWY
missing: E
difficulty: intermediate
restrictions: no multiplication