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

% DET: points H and H_a are not the same

Using the point H_a and the line h_a, construct a line a (rule W10a);

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

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

Using the point E_b and the point H, construct a point B (rule W01);

Using the point H and the point E_b, construct a circle k(E_b,B) (rule W06);

% NDG: points H and E_b are not the same

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

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

% DET: points A and B are not the same

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

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

% DET: points B 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 a and the line h_c, construct a point C (rule W03);

% NDG: lines a and h_c are not parallel

% DET: lines a and h_c are not the same