???????
      ---------
YXECC ) TYXPYCN
       -YXECC
        =====
        JPJPQC
       -JYCJCE
        ======
         YYQTTN
        -YWQWCQ
         ======
         ??????

base: 11
symbols: CEJNPQTUWXY
difficulty: medium
hints: U << N
missing: U