HPH
       +---------
WHQWCC | TXCRWCRH
        -WHQWCC
         ======
         HNPHHXR
        -HTPRNWC
         =======
           NPHGQH
          -WHQWCC
           ======
           PHTRWW

base: 10
letters: CGHNPQRTWX
difficulty: easy
restrictions: no multiplication