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 point H_a and the point M_c, construct a circle k(M_c,A) (rule W06);

% NDG: points H_a and M_c are not the same

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

% NDG: line h_a and circle k(M_c,A) intersect

% DET: points H_a and A must be different

Using the point A and the point M_c, construct a point B (rule W01);

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

% DET: points H_a and B are not the same

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

% DET: points H and B are not the same

Using the circle k(M_c,A), the line h_b, the point M_c and the point B, construct a point H_b (rule W05);

% NDG: line h_b and circle k(M_c,A) intersect

% DET: points B and H_b must be different

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

% DET: points A and H_b are not the same

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

% NDG: lines a and b are not parallel

% DET: lines a and b are not the same