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

% DET: points C and T_c are not the same

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

% NDG: points C and O are not the same

Using the circle k(O,C), the line s_c, the point O and the point C, construct a point N_c (rule W05);

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

% DET: points C and N_c must be different

Using the point N_c and the point O, construct a line m_c (rule W02);

% DET: points N_c and O are not the same

Using the point T_c and the line m_c, construct a line c (rule W10a);

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

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