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

% DET: points C and H_c are not the same

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

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

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

% DET: points H_c and E_c must be different

Using the point E_c and the point C, construct a point H (rule W01);

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

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

Using the point C and the point G, construct a point M_c (rule W01);

Using the point H_c and the point M_c, construct a line c (rule W02);

% DET: points H_c and M_c are not the same

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

% NDG: points C and O are not the same

Using the circle k(O,C) and the line c, construct a point A and a point B (rule W04);

% NDG: line c and circle k(O,C) intersect