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Using the point C and the point Tc, construct a line sc (rule W02);
% DET: points C and Tc are not the same
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Using the point C and the point O, construct a circle k(O,C) (rule W06);
% NDG: points C and O are not the same
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Using the circle k(O,C), the line sc, the point O and the point C, construct a point Nc (rule W05);
% NDG: line sc and circle k(O,C) intersect
% DET: points C and Nc must be different
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Using the point Nc and the point O, construct a line mc (rule W02);
% DET: points Nc and O are not the same
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Using the point Tc and the line mc, construct a line c (rule W10a);
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Using the circle k(O,C) and the line c, construct a point A and a point B (rule W04);
% NDG: line c and circle k(O,C) intersect