Let's move A and B to a plane X and set their intersection point as P (move point P to the intersection point).

After crossing the intersection point, P is the bisector of the internal angle and external angle formed by A and B, and then after crossing these two bisectors, it is the two planes Y and Z perpendicular to X. Because the angles formed by the straight line passing through P, A and B are equal, the straight line can only be found in the y.z plane, so there are two in the Y plane, two in the Z plane and four in a * * *.