????????
      +---------
EGGQE | UGJEMCCJ
       -EGGQE
        =====
        JGJHXC
       -JQGHNP
        ======
         EJGECC
        -JGGHCE
         ======
          JGQPJJ
         -JQGHNP
          ======
          ??????

base: 12
letters: CEGHJLMNPQUX
difficulty: hard
missing: L