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

% NDG: points M_b and N are not the same

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

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

% NDG: points H_a and M_b are not the same

Using the circle k(N,M_a), the circle k(M_b,C), the point H_a, the point N and the point M_b, construct a point H_c (rule W08);

% 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 points H_a and H_c must be different

Choose freely a point A on the circle k(M_b,C) (rule WOncircle)

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

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 point H_c and the point C, construct a line h_c (rule W02);

% DET: points H_c and C are not the same

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

% NDG: lines h_a and h_c are not parallel

% DET: lines h_a and h_c are not the same

Using the point N and the point H, construct a point G (rule W01);

Using the point M_b and the point G, construct a point B (rule W01);