????????
      +---------
ELHEY | QEYECGEM
       -ELHEY
        =====
        JQYHHG
       -JCHYEY
        ======
         PLCLEE
        -PJHQJU
         ======
          JCHNEM
         -JNJLUU
          ======
          ??????

base: 12
letters: CEGHJLMNPQUY
difficulty: medium