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

% DET: points C and T_a are not the same

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

% DET: points C and T_b are not the same

Using the line a, the point T_b, the point C, the point T_a and the line b, construct a line s_c (rule W17);

% NDG: points C and T_a are not the same points T_b and C are not the same

% DET: points C and T_b are not the same

Using the point T_b, the point C and the point T_a, construct a circle circle[T_a,T_b,angle[s[a]][s[b]]] (rule W20);

% NDG: points T_b and C are not the same points C and T_a are not the same points T_a and T_b are not the same

Using the circle circle[T_a,T_b,angle[s[a]][s[b]]] and the line s_c, construct a point C_sa and a point I (rule W04);

% NDG: line s_c and circle circle[T_a,T_b,angle[s[a]][s[b]]] intersect

Using the point I and the point T_a, construct a line s_a (rule W02);

% DET: points I and T_a are not the same

Using the point T_b and the point I, construct a line s_b (rule W02);

% DET: points T_b and I are not the same

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

% NDG: lines a and s_b are not parallel

% DET: lines a and s_b are not the same

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

% NDG: lines b and s_a are not parallel

% DET: lines b and s_a are not the same