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∑ a (a^2 – bc) x^2 (y – z) = 0

X(2), X(10), X(75), X(85), X(334), X(335), X(1581), X(1920), X(1921), X(3912), X(4518), X(4645)

infinite points of pK(X2, X334)

points of pK(X2, X4645) on the Steiner ellipse

K868 is the isotomic transform of K251. Its isogonal transform is K987 = pK(X6 x X2210, X6).

It is a weak cubic anharmonically equivalent to K131 as in Table 67.

Its barycentric product by X(1) is K769.

The tangents at A, B, C are the medians.