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

% DET: points H_a and H_b are not the same

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

% DET: points H_a and T_a are not the same

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

Using the line a, the line H_aH_b, the point T_a, the point H_a and the point H_b, construct a line H_cH_a (rule W18);

% NDG: points T_a and H_a are not the same points H_a and H_b are not the same

% DET: points H_a and T_a are not the same

Using the point T_a, the point H_a and the point H_b, construct a circle circle[T_a,H_b,angle[s[a]][b]] (rule W20);

% NDG: points T_a and H_a are not the same points H_a and H_b are not the same points T_a and H_b are not the same

Using the circle circle[T_a,H_b,angle[s[a]][b]] and the line h_a, construct a point A_ca1 and a point A (rule W04);

% NDG: line h_a and circle circle[T_a,H_b,angle[s[a]][b]] intersect

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

% DET: points A and H_b 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

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

Using the point H_a and the point M_b, construct a circle k(M_b,C) (rule W06);

% NDG: points H_a and M_b are not the same

Using the circle k(M_b,C), the line H_cH_a, the point M_b and the point H_a, construct a point H_c (rule W05);

% NDG: line H_cH_a and circle k(M_b,C) intersect

% DET: points H_a and H_c must be different

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

% DET: points A and H_c are not the same

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

% NDG: lines a and c are not parallel

% DET: lines a and c are not the same