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

% DET: points M_a and H_a are not the same

Using the point H_b and the point M_a, construct a circle k(M_a,B) (rule W06);

% NDG: points H_b and M_a are not the same

Using the circle k(M_a,B) and the line a, construct a point B and a point C (rule W04);

% NDG: line a and circle k(M_a,B) intersect

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

% DET: points H_b and C are not the same

Using the point H_a and the line a, construct a line h_a (rule W10b);

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

% NDG: lines b and h_a are not parallel

% DET: lines b and h_a are not the same