????????
      +---------
WJJXP | EYYPJHNX
       -WJJXP
        =====
        YNNFLH
       -YXEEWH
        ======
         LTMHMN
        -LYXXMT
         ======
          NWYFEX
         -NMHJHH
          ======
          ??????

base: 12
letters: EFHJLMNPTWXY
difficulty: medium