?????????
      +----------
QCPXR | PJQRXLELJ
       -PYREL
        =====
          JXCLE
         -JFTRE
          =====
           ECRFL
          -CJRYT
           =====
           QLTRPJ
          -QQHRFC
           ======
           ??????

base: 12
letters: CEFHJLPQRTXY
difficulty: medium