As for quadrangular pyramid O-ABCD in a figure, the bottom is a square and all the length of OA, OB, OC and OD is equal. K, L, M, N, P, Q, R, and S are the middle points of each side.
This quadrangular pyramid is cut by three planes of the plane which passes along P, K, N, R and the plane which passes along P, L, M, R and the plane which passes along S, K, L, Q and divides into some solids.
Find the ratio of the volume of a solid including the vertex O and the volume of the quadrangular pyramid O-ABCD.