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X(2), X(28), X(56), X(58), X(81), X(86), X(261), X(593), X(1444), X(2975), X(4225), X(8084) vertices of the cevian triangle of X(261) vertices of the anticevian triangle of X(81) 

K320 is the locus of point P whose cevian triangle is perspective to TCP2, the tangential triangle of the 2nd circumperp triangle (see TCCT, ยง6.24). See also table 6. The locus of the perspector is pK(X5019, X2975) passing through X(1), X(56), X(958), X(1468), X(2217), X(2975). See also K321. The isogonal transform of K320 is K901 = pK(X1500, X8). 
