????????
     +---------
YFTF | YTQUULLQ
      -YFTF
       ====
        MLTUL
       -UQYMM
        =====
         ULTTL
        - YFTF
         =====
          FUQYQ
         -FUYQU
          =====
          ?????

base: 7
letters: FLMQTUY
difficulty: medium