????????
      +---------
PNTJU | QXWTUQEE
       -PNTJU
        =====
        GQXHFQ
       -GXXPFE
        ======
         XUNUNE
        -XWNGHP
         ======
          JFLRTE
         -XWNGHP
          ======
          ??????

base: 14
letters: EFGHJLNPQRTUWX
difficulty: medium