Using the point M_a and the point N, construct a line m(H_bH_c) (rule W02);

% DET: points M_a and N are not the same

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

% NDG: points M_a 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_bH_c), the point N and the point M_a, construct a point E_a (rule W05a);

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

% DET: points M_a and E_a must be different

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

Choose freely a point A (rule free)

Using the point A and the point E_a, construct a point H (rule W01);

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

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