????????
      +---------
JRPJQ | QLNRMGLJ
       -RUNHR
        =====
        JLUPQG
       -MUPNMN
        ======
         MMJHQL
        - UUGLP
         ======
          MGJNJJ
         -MJRMGH
          ======
          ??????

base: 10
letters: GHJLMNPQRU
difficulty: intermediate