Using the point E_c and the point M_b, construct a line m(CH_a) (rule W02);

% DET: points E_c and M_b are not the same

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

% DET: points M_b and O are not the same

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

Using the point E_c and the line m_b, construct a line m(CH_b) (rule W16);

Using the point O and the line m(CH_a), construct a line m_a (rule W16);

Using the line m_a and the line m(CH_b), construct a point M_a (rule W03);

% NDG: lines m_a and m(CH_b) are not parallel

% DET: lines m_a and m(CH_b) are not the same

Using the point M_a and the line m_a, construct a line a (rule W10a);

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

% NDG: lines a and b are not parallel

% DET: lines a and b are not the same

Using the point C and the point E_c, construct a point H (rule W01);

Using the point M_b and the point C, construct a point A (rule W01);

Using the point O and the point H, construct a point G (rule W01);

Using the point M_b and the point G, construct a point B (rule W01);