????????
      +---------
TNGRE | ANPRAPTU
       -NRPTU
        =====
        TEPPRP
       -TTAURU
        ======
         RRTMTT
        - AAEGM
         ======
          TENATU
         -TTAURU
          ======
          ??????

base: 9
letters: AEGMNPRTU
difficulty: intermediate