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

% DET: points B and T_b are not the same

Using the point B and the point O, construct a circle k(O,C) (rule W06);

% NDG: points B and O are not the same

Using the circle k(O,C), the line s_b, the point O and the point B, construct a point N_b (rule W05);

% NDG: line s_b and circle k(O,C) intersect

% DET: points B and N_b must be different

Using the point N_b and the point O, construct a line m_b (rule W02);

% DET: points N_b and O are not the same

Using the point T_b and the line m_b, construct a line b (rule W10a);

Using the circle k(O,C) and the line b, construct a point C and a point A (rule W04);

% NDG: line b and circle k(O,C) intersect