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

% DET: points C 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_c and the line a, construct a circle k(T_c,foot[T_c,b]) (rule W11);

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

Using the circle k(T_c,foot[T_c,b]), the point C, the point T_c and the line a, construct a line b (rule W13);

% NDG: point C is outside the circle k(T_c,foot[T_c,b])

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

% NDG: lines b and h_a are not parallel

% DET: lines b and h_a are not the same

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

% DET: points T_c and A are not the same

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

% NDG: lines a and c are not parallel

% DET: lines a and c are not the same