????????
      +---------
PGUXX | GLJYJPWE
       -PGUXX
        =====
        XEUUPP
       -XUXHTW
        ======
         QWTWUW
        -QLWGEE
         ======
          PQHYEE
         -XFTUEU
          ======
          ??????

base: 13
letters: EFGHJLPQTUWXY
difficulty: medium