Using the point B and the point H_c, construct a line c (rule W02);

% DET: points B and H_c 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 c, the point O and the point B, construct a point A (rule W05);

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

% DET: points B and A must be different

Using the point H_c and the line c, construct a line h_c (rule W10b);

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

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