???????
      +--------
TNTEN | QNQUPFE
       -TNTEN
        =====
        TYTWWF
       -EFXJTN
        ======
          NGMUE
         -NNUQN
          =====
          ?????

base: 14
letters: EFGJLMNPQTUWXY
difficulty: hard
attributes: interconnected
missing: L