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_c on the circle k(N,M_a) (rule WOncircle)

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

% NDG: points H_c and M_b are not the same

Using the circle k(N,M_a), the circle k(M_b,C), the point H_c, the point N and the point M_b, construct a point H_a (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_c and H_a 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_c, construct a line c (rule W02);

% DET: points A and H_c are not the same

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

% DET: points H_a and C are not the same

Using the line c and the line a, construct a point B (rule W03);

% NDG: lines c and a are not parallel

% DET: lines c and a are not the same