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

% DET: points C and H_a are not the same

Using the point C and the point H_b, construct a line b (rule W02);

% DET: points C and H_b are not the same

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

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

% NDG: lines h_a and b are not parallel

% DET: lines h_a and b are not the same

Using the point H_b and the line b, construct a line h_b (rule W10b);

Using the line h_b and the line a, construct a point B (rule W03);

% NDG: lines h_b and a are not parallel

% DET: lines h_b and a are not the same