QWQJ
       +----------
JFFWQN | GHPJNPFNH
        -GHWWNP
         ======
           PJWWFN
          -GHWWNP
           ======
           HQWWWAH
          -HWAFWGQ
           =======
            HJNMPM

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