WLU
       +---------
UYYLMG | AWFLLGAA
        -UYYLMG
         ======
         MAGRNRA
        -MGUAWUY
         =======
          MRWYULA
         -YGWMGFR
          =======
           MAFFAA

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