QAU
       +---------
ACQJJC | UACUCWWA
        -WJJUUJ
         ======
          WAYAJW
         -ACQJJC
          ======
          AAUQCUA
         -AYUUQQW
          =======
            CJUAJ

base: 7
letters: ACJQUWY
difficulty: medium