AFL
       +---------
GNRRFQ | QGALTFRW
        -GNRRFQ
         ======
         ARGFNNR
        -ALFGAAR
         =======
          AJJGGTW
         -AQNNGQQ
          =======
           AARWLJ

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