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

% DET: points B and H_a are not the same

Using the point B and the point H_b, construct a line h_b (rule W02);

% DET: points B and H_b are not the same

Using the point H_b and the line h_b, construct a line b (rule W10a);

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

% NDG: lines b and a are not parallel

% DET: lines b and a are not the same

Using the point H_a and the line a, construct a line h_a (rule W10b);

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

% NDG: lines b and h_a are not parallel

% DET: lines b and h_a are not the same