????????
      +---------
NXTNH | NJGTXQGM
       -NXTNH
        =====
         JTXQQ
        -NXTNH
         =====
         HNJTFG
        -HRHGRG
         ======
          LRJNXM
         -LHLTHT
          ======
          ??????

base: 13
letters: FGHJLMNQRTWXY
missing: Y W
difficulty: medium
hints: Y << J, W << F