MYQ
      +--------
PWEQL | QEQJWHH
       -YGYYH
        =====
        PPXYRH
       -XQRWWJ
        ======
         PEGPGH
        -PMHLLW
         ======
           MJYM

base: 13
letters: EGHJLMPQRTWXY
difficulty: hard
missing: T