????????
      +---------
MFRMM | RXUWTFTT
       -GWUGG
        =====
         JPXGF
        -XJEUU
         =====
          GPUWT
         -MFRMM
          =====
           URJRT
          -FWMTT
           =====
           ?????

base: 11
letters: EFGJMPRTUWX
difficulty: medium