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

% NDG: points H_b and N are not the same

Choose freely a point E_b on the circle k(N,M_a) (rule WOncircle)

Using the point E_b and the point H_b, construct a line h_b (rule W02);

% DET: points E_b and H_b are not the same

Using the point E_b and the point N, construct a line m(H_aH_c) (rule W02);

% DET: points E_b and N are not the same

Using the circle k(N,M_a), the line m(H_aH_c), the point N and the point E_b, construct a point M_b (rule W05a);

% NDG: line m(H_aH_c) and circle k(N,M_a) intersect

% DET: points E_b and M_b must be different

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

% DET: points M_b and H_b are not the same

Choose freely a point A on the line b (rule WOnline1)

Using the point A and the point M_b, construct a point C (rule W01);

Using the point A and the point M_b, construct a circle k(M_b,C) (rule W06);

% NDG: points A and M_b are not the same

Using the circle k(N,M_a) and the circle k(M_b,C), construct a point H_a and a point H_c (rule W07);

% NDG: circles k(N,M_a) and k(M_b,C) intersect

% DET: circles k(N,M_a) and k(M_b,C) are not the same

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

% DET: points A and H_a are not the same

Using the line h_b and the line h_a, construct a point H (rule W03);

% NDG: lines h_b and h_a are not parallel

% DET: lines h_b and h_a are not the same

Using the point E_b and the point H, construct a point B (rule W01);