????????
      +---------
EYXTJ | HNFJJRHL
       -EYXTJ
        =====
        GUUXQR
       -ULNLGL
        ======
         UHXRFH
        -UEUGHX
         ======
          GHHGLL
         -GNRHRG
          ======
          ??????

base: 13
letters: EFGHJLNQRTUXY
difficulty: medium