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X(3), X(4), X(83), X(8718), X(550)*

vertices of the circum-normal triangle

infinite points of pK(X6, X550)

K664 is a circum-normal cubic as in Table 25. It is spK(X550, X548) as in CL055.

It is the isogonal transform of the stelloid K665.

We meet this cubic in the paper "Another kind of Lemoine cubics" and also in Table 43.