XUX
       +---------
HQUTLJ | PAATJJAL
        -HQUTLJ
         ======
         LAHAHAA
        -TQJJHTT
         =======
           UTQJPL
          -HQUTLJ
           ======
           XLLGHU

base: 10
letters: AGHJLPQTUX
difficulty: medium
restrictions: no multiplication