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X(1), X(3), X(147), X(194), X(511), X(2930), X(7772)


In Table 57, it is mentioned that any spK(P, Q = midpoint of K,P) passes through the vertices of the Grebe triangle and other points detailed there.

This spK is a K+ if and only if P lies on K837.

K837 is a circular cubic with focus F = X(14692) = X4,X147 /\ X98,X549 /\ X99,X548.

For example, with P = X3 we obtain the stelloid K643.