Geodesic
A Three Dimensional Analogue of Pappus's Theorem
Canadian mathematical bulletin, Tome 11 (1968) no. 5, p. 717

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If P, Q, R are any three points on a line a and p, q, r are any three lines that pass through a point O and lie in a plane n. which meets the line a in a point A distinct from O, then the three lines l = Qr ⋅ Rq, m = Rp ⋅ P r, n = P q ⋅ Qp lie in a plane (through O). 
Phadke, B.B. A Three Dimensional Analogue of Pappus's Theorem. Canadian mathematical bulletin, Tome 11 (1968) no. 5, p. 717. doi: 10.4153/CMB-1968-085-8
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     title = {A {Three} {Dimensional} {Analogue} of {Pappus's} {Theorem}},
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