WPGWX
       +-----------
ANHHHN | HPNCPTGTNX
        -ANHHHN
         ======
          CGNMCGT
         -CNNXXWP
          =======
            TTWNTN
           -ANHHHN
            ======
            MXMAWPX
           -MMAGGNN
            =======
              NPCCH

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