????????
      +---------
JQHCP | WQTMPWLM
       -JQHCP
        =====
        HXMWXW
       - PWQJC
        ======
         HCMWPL
        -HQLJMW
         ======
          TJHCQM
         -TTYJTT
          ======
          ??????

base: 12
letters: CEHJLMPQTWXY
difficulty: hard
missing: E