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X(6), X(67), X(141), X(524) 

K531 is the locus of point P such that the cevian triangle of P is perspective to the second Brocard triangle. The locus of the perspector is K538. K531 meets the line at infinity at X(524) and two other points on the circumconic (C) with perspector X(32). The polar conic of K is the Jerabek hyperbola. 
