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Using the point A and the point Ta, construct a line sa (rule W02);
% DET: points A and Ta are not the same
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Using the point A and the point O, construct a circle k(O,C) (rule W06);
% NDG: points A and O are not the same
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Using the circle k(O,C), the line sa, the point O and the point A, construct a point Na (rule W05);
% NDG: line sa and circle k(O,C) intersect
% DET: points A and Na must be different
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Using the point Na and the point O, construct a line ma (rule W02);
% DET: points Na and O are not the same
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Using the point Ta and the line ma, construct a line a (rule W10a);
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Using the circle k(O,C) and the line a, construct a point C and a point B (rule W04);
% NDG: line a and circle k(O,C) intersect