????????
      ----------
UUWWP ) QXJYYQTU
       -UUWWP
        =====
        CTHUUQ
       -YQJYYU
        ======
         JFFFCT
        -JJJXXR
         ======
          JTUWYU
         - UUWWP
          ======
          ??????

base: 12
symbols: CFHJPQRTUWXY
difficulty: medium