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

% NDG: points H_c 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 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 H_c and the point E_b, construct a circle k(E_b,B) (rule W06);

% NDG: points H_c and E_b are not the same

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

% NDG: circles k(N,M_a) and k(E_b,B) intersect

% DET: circles k(N,M_a) and k(E_b,B) 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