????????
      +---------
PPGWT | HPJHFTUU
       -TTFWC
        =====
         CPTLT
        -LCXGG
         =====
          GCFPU
         -GGHWF
          =====
           JGPHU
          -FJPPJ
           =====
           ?????

base: 11
letters: CFGHJLPTUWX
difficulty: medium