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

% DET: points H and H_b are not the same

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

Using the point H, the line b and the point H_b, construct a line h_H,1/2(b) (rule W15);

Choose freely a point E_a on the line h_H,1/2(b) (rule WOnline4)

Using the point E_a and the point H, construct a point A (rule W01);

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

% NDG: points H and E_a are not the same

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

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

% DET: points B and A are not the same

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

% NDG: line c and circle k(E_a,A) intersect

% DET: points A and H_c must be different

Using the point H_c and the point H, construct a line h_c (rule W02);

% DET: points H_c and H are not the same

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

% NDG: lines b and h_c are not parallel

% DET: lines b and h_c are not the same