Text Box: “amida-kuji” is a drawing system of lots as shown in the following picture. Pick C among A,B,…,and G at the top, for example, trace the tracks down the vertical lines and (must) go over bridges(side trackes), and then reach to q at the bottom. Only 1 bridge is allowed to contact any single point on a vertical line. Prove that two picks in A to G at the top can not reach to the same end point at the bottom.