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too complicated to be written here. Click on the link to download a text file. 

X(3), X(4) points at infinity of the circumconic (C) with center X(5), perspector X(216) Ha, Hb, Hc : vertices of the orthic triangle Oa, Ob, Oc : vertices of the cevian triangle of O 

Q022 is a bicircular isogonal sextic. It is the locus of P such that the orthotransversals of P and its isogonal conjugate P* are perpendicular (together with the line at infinity and the circumcircle). See also Q021.

