function y=caoji(a)    % 由K項集產生K+1項集
[m,n]=size(a);
y=[];
if n==1
    for i=1:m-1
        for j=i+1:m
            temp=[a(i,:),a(j,n)];
            y=[y;temp];
        end
    end
else
    for i=1:m-1
        for j=i+1:m
            if a(i,1:n-1)==a(j,1:n-1)
                temp=[a(i,:),a(j,n)];
                y=[y;temp];
            end
        end
    end
end