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

% DET: points C and H_b are not the same

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

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

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

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

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

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

% NDG: lines a and h_b are not parallel

% DET: lines a and h_b are not the same

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

% DET: points T_c and B are not the same

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

% NDG: lines b and c are not parallel

% DET: lines b and c are not the same