Using the point M_b and the point G, construct a point B (rule W01);

Using the point H_c and the point B, construct a line c (rule W02);

% DET: points H_c and B are not the same

Using the point H_c and the point M_b, construct a circle k(M_b,C) (rule W06);

% NDG: points H_c and M_b are not the same

Using the circle k(M_b,C), the line c, the point M_b and the point H_c, construct a point A (rule W05);

% NDG: line c and circle k(M_b,C) intersect

% DET: points H_c and A must be different

Using the point A and the point M_b, construct a point C (rule W01);