HPW
       +---------
HCCTFN | WHCLNLNW
        -FFLCRH
         ======
         HCHCFHN
        -HLPNHUL
         =======
          HTRTHHW
         -HHRWWLW
          =======
            PLTWU

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