Find the 4 orientations required for the general and special cases
o1 = orientation ( p1 , q1 , p2 ) NEW_LINE o2 = orientation ( p1 , q1 , q2 ) NEW_LINE o3 = orientation ( p2 , q2 , p1 ) NEW_LINE o4 = orientation ( p2 , q2 , q1 ) NEW_LINE