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centers of the 3 Apollonian circles.

K151 is the locus of point P such that the pedal triangles of P and its X(99)-isoconjugate P* are parallelogic. It is a special case of nK0+ as seen in K150. It is a member of the class CL022 of cubics.

The three asymptotes concur at X intersection of the lines X351-X670 and X468-isotomic conjugate of X647.