Using the point H_b and the point E_c, construct a circle k(E_c,C) (rule W06);

% NDG: points H_b and E_c are not the same

Choose freely a point C on the circle k(E_c,C) (rule WOncircle)

Using the point C and the point E_c, construct a point H (rule W01);

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

% DET: points C and H_b are not the same

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 A on the line b (rule WOnline1)

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 circle k(E_c,C), the line h_a, the point E_c and the point H, construct a point H_a (rule W05);

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

% DET: points H and H_a must be different

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

% DET: points H_a and C 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