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

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

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

Choose freely a point A on the line b (rule WOnline1)

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

% NDG: points A and M_b are not the same

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

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

% DET: points A and H_a must be different

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

% DET: points C and H_a are not the same

Using the line h_b and the line a, construct a point B (rule W03);

% NDG: lines h_b and a are not parallel

% DET: lines h_b and a are not the same