????????
      ----------
QLNXW ) XTQYXQUL
       -QLNXW
        =====
        UQXTJQ
       - WNXRL
        ======
         QNNTXU
        -QTLLRU
         ======
          TLMTYL
         -TQUPWR
          ======
          ??????

base: 12
symbols: JLMNPQRTUWXY
difficulty: medium