RTHE
      +---------
RRRTE | CTQUFECL
       -TTTHJ
        =====
         ULQJE
        -LLHEF
         =====
         QUREQC
        -QLLULL
         ======
          QTEJLL
         -QTTCUC
          ======
            RLHJ

base: 11
letters: CEFHJLNQRTU
difficulty: intermediate
restrictions: no multiplication
missing: N