????????
      +---------
UHUPH | HMPFQFJL
       -HJJTUP
        ======
         HMPRTJ
        -HJJTUP
         ======
          HMFJHL
         -HJJTUP
          ======
          ??????

base: 11
letters: FHJLMNPQRTU
missing: N
difficulty: hard
hints: P << J, F < P, H << R, N