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

% DET: points E_a and N are not the same

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

% NDG: points E_a 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 E_a, construct a point M_a (rule W05a);

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

% DET: points E_a and M_a must be different

Using the point M_a and the point C, construct a point B (rule W01);

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

% DET: points C and M_a are not the same

Using the circle k(N,M_a), the line a, the point N and the point M_a, construct a point H_a (rule W05);

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

% DET: points M_a and H_a must be different

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

% DET: points H_a and E_a are not the same

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

% NDG: points C and M_a are not the same

Using the circle k(N,M_a) and the circle k(M_a,B), construct a point H_b and a point H_c (rule W07);

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

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

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

% DET: points C and H_b are not the same

Using the line h_a and the line b, construct a point A (rule W03);

% NDG: lines h_a and b are not parallel

% DET: lines h_a and b are not the same