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X(1), X(2), X(9), X(86), X(238), X(239), X(292), X(673), X(893), X(1447), X(1929), X(1966), X(2238), X(6626), X(6651), X(7261), X(8299), X(9470), X(19557), X(39044)

midpoints of ABC

K251 is the isogonal transform of K135 and the isotomic transform of K868.

Its anticomplement is K1002.

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

It meets the line at infinity at the same points as pK(X2, X4645) and the Steiner ellipse at the same points as pK(X2, X238).