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

% DET: points B and H_a are not the same

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

% NDG: points H_a and E_c are not the same

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

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

% DET: points H_a and C must be different

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

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

% DET: points B and H are not the same

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

% DET: points H_a and H are not the same

Using the circle k(E_c,C), the line h_b, the point E_c and the point H, construct a point H_b (rule W05);

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

% DET: points H and H_b must be different

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 line h_a and the line b, construct a point A (rule W03);

% NDG: lines h_a and b are not parallel

% DET: lines h_a and b are not the same