YFWR
      +---------
LXCYE | YHXNNUUN
       -YXHNP
        =====
         FHXLU
        -FXRFR
         =====
          FXEPU
         -WXPCW
          =====
           RNEWN
          -RCLYF
           =====
            UHLF

base: 12
letters: CEFHLNPRUWXY
difficulty: easy
restrictions: no multiplication