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X(2), X(25), X(251), X(427)

vertices of the fourth Brocard triangle

K533 (resp. K535) is the locus of point P such that the cevian (resp. anticevian) triangle of P is perspective to the fourth Brocard triangle. In both cases, the locus of the perspector is K539.

K539 is the isogonal transform of K538. These two cubics generate a pencil that contains K326.