Using the point H_b and the point H, construct a line h_b (rule W02);

% DET: points H_b and H are not the same

Choose freely a point B on the line h_b (rule WOnline1)

Using the point H_b and the line h_b, construct a line b (rule W10a);

Choose freely a point A on the line b (rule WOnline2)

Using the point A and the point B, construct a point M_c (rule W01);

Using the point A and the point H, construct a line h_a (rule W02);

% DET: points A and H are not the same

Using the point A and the point M_c, construct a circle k(M_c,A) (rule W06);

% NDG: points A and M_c are not the same

Using the circle k(M_c,A), the line h_a, the point M_c and the point A, construct a point H_a (rule W05);

% NDG: line h_a and circle k(M_c,A) intersect

% DET: points A and H_a must be different

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

% DET: points H_a and B are not the same

Using the line b and the line a, construct a point C (rule W03);

% NDG: lines b and a are not parallel

% DET: lines b and a are not the same