????????
      +---------
JYJYE | CLJXFCJR
       -JYJYE
        =====
        YYTFLC
       - JYJYE
        ======
         ECCYFJ
        -EFCFXF
         ======
          LRFRLR
         -LCXCFL
          ======
          ??????

base: 10
letters: CEFJLRTUXY
difficulty: easy
missing: U