????????
      +---------
UJUXJ | LHXXJHEU
       -FXLFX
        =====
        CCCCFH
       -CWUCNE
        ======
          XWCLE
         -FXLFX
          =====
          CCJWJU
         -CWUCNE
          ======
          ??????

base: 10
letters: CEFHJLNUWX
difficulty: intermediate