????????
      +---------
EQUUF | WPHRWNHW
       -WEJJN
        =====
         UHHYN
        -EQUUF
         =====
          FWFEH
         -LWFME
          =====
          HYYLNW
         -HWNULU
          ======
          ??????

base: 13
letters: EFHJLMNPQRUWY
difficulty: medium