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

% DET: points A and B are not the same

Using the point I and the line c, construct a circle k(I,P_a) (rule W11);

% NDG: point I is not incident to the line c

Using the circle k(I,P_a), the point A, the point I and the line c, construct a line b (rule W13);

% NDG: point A is outside the circle k(I,P_a)

Using the circle k(I,P_a), the point B, the point I and the line c, construct a line a (rule W13);

% NDG: point B is outside the circle k(I,P_a)

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