???????
      +--------
TGRFY | YFCLYJL
       -TGRFY
        =====
         GRYEJ
        -GGUTC
         =====
          YXCFL
         -TGRFY
          =====
          ?????

base: 12
letters: CEFGJLNRTUXY
difficulty: challenging
hints: T << L, X << G
missing: N