XUYQ
      ----------
 QYQQ ) XUACNEUN
       -EQWQU
        =====
         UYCXE
        -WQEQX
         =====
          YYXQU
         -UQCQE
          =====
           QENAN
          -YQNQC
           =====
            EQAQ

base: 10
symbols: ACEFNQUWXY
difficulty: intermediate
missing: F