????????
      +---------
JELGU | RFEHEFRG
       -JELGU
        =====
        GYCYJF
       -GEFHYJ
        ======
          WFLRR
         -UWWCG
          =====
          HNWHLG
         - YUNUF
          ======
          ??????

base: 12
letters: CEFGHJLNRUWY
difficulty: medium