PPC
       +---------
TNGTNH | MWMMWWWY
        -TNGTNH
         ======
         PJJPJWW
        - TNGTNH
         =======
          NTNCJWY
         -NYJNYHH
          =======
           GPPPWY

base: 10
letters: CGHJMNPTWY
difficulty: intermediate
restrictions: no multiplication