????????
      +---------
EMRFE | HUNURMRE
       -UFPYU
        =====
        ERJHEM
       -EEYJRL
        ======
         EURLQR
        -EEYJRL
         ======
           XLXME
          -HXYLR
           =====
           ?????

base: 13
letters: EFHJLMNPQRUXY
difficulty: medium