????????
      +---------
PGYJY | UGRGRJXJ
       -PGYJY
        =====
        WXWUNJ
       - PGYJY
        ======
         GLGPWX
        -GYYGPW
         ======
          TLTTMJ
         -TLXNPM
          ======
          ??????

base: 12
letters: GJLMNPRTUWXY
difficulty: intermediate