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

% DET: points B and C are not the same

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

% DET: points B and T_c are not the same

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 c, construct a point A (rule W03);

% NDG: lines b and c are not parallel

% DET: lines b and c are not the same