????????
      +---------
JNQRG | TJNQFJGG
       -JNQRG
        =====
        UTFYNJ
       -UQPFPJ
        ======
         XYJXYG
        -QHNYGU
         ======
          QTQQHG
         -QXEGPX
          ======
          ??????

base: 14
letters: EFGHJMNPQRTUXY
difficulty: hard
missing: M