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X(2), X(4), X(393), X(403), X(1138), X(1300), X(1989), X(1990)

O1, O2 on the orthic axis and on the circumcircle

K490 is the cubic Kc1(X4) in CL053.

The barycentric quotient of K490 by H is K611 = pK(X2, X340).