????????
      +---------
YFWJX | FNNFFJFJ
       -YFWJX
        =====
        XJQPWJ
       -XMLYPQ
        ======
          GJFGF
         -PJWYF
          =====
          XNXLNJ
         - PJWYF
          ======
          ??????
 
base: 11
letters: FGJLMNPQWXY
difficulty: intermediate