FFLL
      +---------
NCXCU | CNLTNPFF
       -NCXCU
        =====
         GLPGP
        -NCXCU
         =====
         ECLFNF
        -ELGGUX
         ======
          EJEUEF
         -ELGGUX
          ======
            PGLE

base: 11
letters: CEFGJLNPTUX
difficulty: medium
restrictions: no multiplication