The points P(4,3),Q(6,4),R(5,6) and S(3,5) respectively are the vertices of a quadrilateral which is
ABCD is a convex quadrilateral with 3, 4, 5 and 6 points marked on its sides AB, BC, CD and DA respectively. Triangles are formed using these 18 points and original vertices of the quadrilateral. Number of such triangles that do not have any side or part of a side common with the quadrilateral are