Using the point E_b and the point H_b, construct a line h_b (rule W02);

% DET: points E_b and H_b are not the same

Using the point H_b and the line h_b, construct a line b (rule W10a);

Using the point G, the line h_b and the point E_b, construct a line h_G,-1/2(h_b) (rule W15);

Using the line h_G,-1/2(h_b) and the line b, construct a point M_b (rule W03);

% NDG: lines h_G,-1/2(h_b) and b are not parallel

% DET: lines h_G,-1/2(h_b) and b are not the same

Using the point M_b and the point G, construct a point B (rule W01);

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

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

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

% NDG: points B and O are not the same

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

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