Mathematics is a compulsory course in senior two.

Suppose e and f are in the ABD plane, then p is in the ABD plane.

Suppose g and h are in the plane CBD, then p is in the plane CBD.

Because E, F, G and H are not * * * planes, the plane ABD and the plane CBD do not overlap, and the two planes intersect on the straight line BD, so P is on the intersection line BD. That is, b, d and p are on the same straight line.

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