r1262	duality, symmedian point, orthic axis, Steiner inellipse
r1271	point X(75), complement, equal parallelian point, point X(37)
r1504	circumcevian triangle, orthocenter, isogonal points, concyclic points
r1506	isotomic points
r1652	circumcevian triangle, isogonal points, orthocenter
r1987	orthologic triangles, isogonal points

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