JYF
       +---------
EUHLFP | PFLMUEJP
        -ULHMFJ
         ======
         LPHFUFJ
        -LHFYLXJ
         =======
          EYQYLGP
         -EMPYPPJ
          =======
           LHFJJH

base: 12
letters: EFGHJLMPQUXY
difficulty: medium