????????
      +---------
EQNNX | MJXHJRQE
       -EQNNX
        =====
         GGTTR
        -JTMPL
         =====
         RHYMJQ
        -RHRRPJ
         ======
           PENPE
          -EQNNX
           =====
           ?????

base: 14
letters: EFGHJLMNPQRTXY
difficulty: hard
missing: F