LNEU
      +---------
HLEXC | XEXHEMXU
       -HLEXC
        =====
        LNGUNM
       -LHGWGP
        ======
         CWPGUX
        -LMUHNC
         ======
          CUNYCU
         -CPNGMP
          ======
            UMNL

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