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

% DET: points H_a and H are not the same

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

% DET: points H_b and H are not the same

Using the point H_a and the line h_a, construct a line a (rule W10a);

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

% NDG: lines a and h_b are not parallel

% DET: lines a 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 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

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