????????
      +---------
RMRFT | LJHEFXFM
       -XPTLT
        =====
         XEJYX
        -FJMMC
         =====
          LTEXF
         -XPTLT
          =====
           HCLYM
          -PCXPY
           =====
           ?????

base: 12
letters: CEFHJLMPRTXY
difficulty: medium