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

% DET: points M_a and H_a are not the same

Using the point H_a and the line a, construct a line h_a (rule W10b);

Using the point M_a, the line h_a and the point H_a, construct a line h_Ma,1/3(h_a) (rule W15);

Choose freely a point G on the line h_Ma,1/3(h_a) (rule WOnline4)

Using the point G and the point M_a, construct a point A (rule W01);

Choose freely a point B on the line a (rule WOnline1)

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