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X(4), X(14), X(15), X(531), X(671), X(1337), X(2378)

K303a = DF(X15) is a Droz-Farny cubic, a member of the class CL039.

The singular foci of K303a and K303b lie on the Brocard axis and are symmetric with respect to X(2080).

These points are X(5615) and X(5611) respectively.