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

% DET: points O and M_b are not the same

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

% DET: points O and M_c are not the same

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

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

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

% NDG: lines c and b are not parallel

% DET: lines c and b are not the same

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

Using the point M_c and the point A, construct a point B (rule W01);