????????
      ----------
XXXNJ ) XTRREGJE
       -XXXNJ
        =====
         LUHRG
        -LLTUH
         =====
          LYXEJ
         -LLTUH
          =====
           UHRYE
          -UURGN
           =====
           ?????

base: 12
symbols: EFGHJLNRTUXY
difficulty: medium
missing: F