????????
      +---------
GUPJL | WQXPMLPP
       -WGMUJ
        =====
         UPLXL
        -JQXXG
         =====
          CFECP
         -PXWCQ
          =====
          GCCFLP
         -GPFUPU
          ======
          ??????

base: 12
letters: CEFGJLMPQUWX
difficulty: medium