Let L1 be the line through the points (1, 2, 6) and (2, 4, 8). Let L2 be the line of intersection of the planes P1 and P2, where P1 is the plane x - y + 2z + 1 = 0 and P2 is the plane through the points (3, 2, -1), (0, 0, 1), and (1, 2, 1). Do the lines L1 and L2 intersect? If they intersect, then find the point of intersection between L1 and L2. If the lines do not intersect, then find two points A and B such that A lies on L1, B lies on L2, and the segment AB is perpendicular to both L1 and L2.