????????
      +---------
RNRJT | RFMFLRRJ
       -RNRJT
        =====
         TPTQR
        -YMYYX
         =====
          URJPR
         -FFFYM
          =====
           ELRLJ
          -RNRJT
           =====
           ?????

base: 14
letters: EFGJLMNPQRTUXY
difficulty: intermediate
missing: G