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centers of the 3 Apollonius 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 X351X670 and X468isotomic conjugate of X647. X is now X(23356) in ETC (20180919). 
