LYY
       +---------
CMUCHC | YUQHQYCW
        -JWUQWL
         ======
          HQCJWC
         -QHCUHY
          ======
           AULMJW
          -QHCUHY
           ======
           CWMWYY

base: 10
letters: ACHJLMQUWY
difficulty: intermediate
restrictions: no multiplication