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∑ a^2 (a^4 - b^2 c^2) x^2 (y - z) = 0

X(2), X(76), X(141), X(264), X(325), X(334), X(1916)

tX1691 = isotomic conjugate of X(1691)

vertices of the cevian triangle of tX1691

Geometric properties :

K1023 is the isotomic transform of K252 and the isogonal transform of K1033.

It is a cubic anharmonically equivalent to K020 as in Table 66.