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

% DET: points B 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 T_b and the line a, construct a circle k(T_b,foot[T_b,c]) (rule W11);

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

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

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

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

% NDG: lines c and h_a are not parallel

% DET: lines c and h_a are not the same

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

% DET: points T_b and A are not the same

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