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points Ua, Ub, Uc mentioned in the Neuberg cubic page. See also table 16 and table 18.

K331 is an example of circular cubic passing through the points Ua, Ub, Uc hence it is very comparable to the Neuberg cubic.

Its singular focus is F = X(729) whose antipode F' lies on the cubic. Its real asymptote is parallel to the line H-X(2489).