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

% DET: points H_a and T_a are not the same

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

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

Choose freely a point A on the line h_a (rule WOnline2)

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

% DET: points A and C are not the same

Using the point T_a and the line b, construct a circle k(T_a,foot[T_a,c]) (rule W11);

% NDG: point T_a is not incident to the line b

Using the circle k(T_a,foot[T_a,c]), the point A, the point T_a and the line b, construct a line c (rule W13);

% NDG: point A is outside the circle k(T_a,foot[T_a,c])

Using the line c and the line a, construct a point B (rule W03);

% NDG: lines c and a are not parallel

% DET: lines c and a are not the same