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X(4), X(6), X(22), X(30), X(1297) 

K537 is the locus of point P such that the antipedal triangle of P is perspective to the fourth Brocard triangle. K537 is a circular cubic with singular focus X(9970), on the lines X(3)X(1177), X(4)X(542), X(5)X(67). The isogonal transform of K537 is K536. 
