Thank you for help.
i everything i can but still doesnt work
i think i should use findall as well?

i am trying to use prolog to solve kakuro. the question is to fill in the white squares with digits 1 through 9 so that they sum to the numbers shown in the dark squares. A dark square is shown with one or two sums, separated by a diagonal line. A sum above the diagonal denotes the total of the row ...