????????
      +---------
UMWUE | THXHYXPY
       -UMWUE
        =====
        UJQUHX
       -UTNMUM
        ======
         PJTPJP
        -PXYXUW
         ======
          UTGXTY
         -UTNMUM
          ======
          ??????

base: 13
letters: EGHJMNPQTUWXY
difficulty: medium