UUYF
      +---------
GUUYU | GTECWXTU
       -GUUYU
        =====
         CLEFX
        -GUUYU
         =====
         UWLUJT
        -UYYYWY
         ======
          YYXEGU
         -UTFFEF
          ======
           LCFPJ

base: 12
letters: CEFGJLPTUWXY
difficulty: intermediate
restrictions: no multiplication