FXRN
      +---------
XHYJN | PJYLXULF
       -PLCCN
        =====
         CCUCU
        -FCHHF
         =====
         XLXHYL
        -YRJFFN
         ======
          YCRNFF
         -YCYYYF
          ======
            PJHL

base: 12
letters: CEFHJLNPRUXY
difficulty: intermediate
missing: E