Using the point A and the point G, construct a point M_a (rule W01);

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

% DET: points A and H_c are not the same

Using the point H_c and the point M_a, construct a circle k(M_a,B) (rule W06);

% NDG: points H_c and M_a are not the same

Using the circle k(M_a,B), the line c, the point M_a and the point H_c, construct a point B (rule W05);

% NDG: line c and circle k(M_a,B) intersect

% DET: points H_c and B must be different

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

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