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Using the point B and the point Tb, construct a line sb (rule W02);
% DET: points B and Tb are not the same
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Using the point B and the point O, construct a circle k(O,C) (rule W06);
% NDG: points B and O are not the same
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Using the circle k(O,C), the line sb, the point O and the point B, construct a point Nb (rule W05);
% NDG: line sb and circle k(O,C) intersect
% DET: points B and Nb must be different
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Using the point Nb and the point O, construct a line mb (rule W02);
% DET: points Nb and O are not the same
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Using the point Tb and the line mb, construct a line b (rule W10a);
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Using the circle k(O,C) and the line b, construct a point C and a point A (rule W04);
% NDG: line b and circle k(O,C) intersect