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

% DET: points H_b and T_b are not the same

Choose freely a point A on the line b (rule WOnline1)

Using the point H_b and the line b, construct a line h_b (rule W10b);

Choose freely a point B on the line h_b (rule WOnline2)

Using the point B and the point A, construct a line c (rule W02);

% DET: points B and A are not the same

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

% NDG: point T_b is not incident to the line c

Using the circle k(T_b,foot[T_b,c]), the point B, the point T_b and the line c, construct a line a (rule W13);

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

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

% NDG: lines a and b are not parallel

% DET: lines a and b are not the same