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X(2), X(4), X(6), X(24), X(393), X(847), X(2052), X(6515) vertices of the anticevian triangle of H infinite points of pK(X6, X394) points of pK(X6, X6515 = aX394) on (O) 

We meet K621 in Table 43. It is the locus of point M such that there is a cubic (K) passing through the vertices of the anticevian triangle of M. K621 is the isogonal transform of pK(X577, X2) and the isotomic transform of pK(X3926, X76). Note that X393, X577, X3926 are the barycentric squares of X(4), X(3), X(69) respectively. K621 is also the barycentric product of K045 by H. 
