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

% NDG: points H_b and M_c are not the same

Using the circle k(M_a,B), the circle k(M_c,A), the point H_b, the point M_a and the point M_c, construct a point B (rule W08);

% NDG: circles k(M_a,B) and k(M_c,A) intersect

% DET: circles k(M_a,B) and k(M_c,A) are not the same points H_b and B must be different

Using the point B and the point M_a, construct a point C (rule W01);

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