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X(2), X(3), X(23), X(111), X(187), X(2930), X(3098), X(14830) vertices of the CircumTangential triangle Y = X(3)X(67) /\ X(30)X(98) = X(14830) fixed points of the involution f in page K024 

K728 is pkT(X23) as defined in the page K024. It is the only circular cubic of this type. The singular focus is X(14681). 
