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X(1), X(15), X(16), X(36), X(58), X(106), X(202), X(203), X(214), X(501), X(758), X(1130), X(3065) vertices of the incentral triangle 

K206 is the unique circular pK with pivot X(1). Its pole is X(7113) = barycentric product of X(1) and X(36). It is Z(X1, X80) in Clark Kimberling's notations. See also Table 37. Its singular focus is X(1283), not on the curve. The isogonal transform of K206 is K058. 
