UWUY
      +---------
XHQHY | YYYXGTXJ
       -XHQHY
        =====
        QGXLWT
       -QXTUJH
        ======
         UUNYLX
        - XHQHY
         ======
          TWTJGJ
         -TWNYXU
          ======
            QYUW

base: 11
letters: GHJLNQTUWXY
difficulty: medium
restrictions: no multiplication