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X(3), X(13), X(14), X(262), X(511), X(1157), X(1297), X(2979)

Geometric properties :

K939 is the orthopivotal cubic O(X2979).

Its singular focus F = X(15561) is the Psi-transform of X(2979) and actually the centroid of triangle X(3)X(4)X(99). F lies on the lines {2,2782}, {3,114}, {5,99}, etc.

The isogonal transform of K939 is K940.