????????
      +---------
PEMUT | JQUETXTJ
       -PEMUT
        =====
        UEXRGX
       -UXGLTJ
        ======
         PPEPMT
        -PGTJXN
         ======
          UTLNUJ
         -UENHWU
          ======
          ??????

base: 14
letters: EGHJLMNPQRTUWX
difficulty: hard