HGML
       +-----------
EUHJLU | MRHPPUXULG
        -JXHHLPG
         =======
          RXJPREU
         -RUXELLH
          =======
           UJMRMML
          -UUXRLGU
           =======
             ELMPMG

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