XXE
      +---------
JXUNN | XUWWUXXF
       -QWUHFQ
        ======
         XFFFHX
        -QWUHFQ
         ======
          EXXTHF
         -WTQLUN
          ======
           JHUEJ

base: 12
letters: EFHJLNQTUWXY
difficulty: medium
missing: Y