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Using the point B and the point Ta, construct a line a (rule W02);
% DET: points B and Ta 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 a, the point O and the point B, construct a point C (rule W05);
% NDG: line a and circle k(O,C) intersect
% DET: points B and C must be different
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Using the point C and the point B, construct a point Ma (rule W01);
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Using the point O and the point Ma, construct a line ma (rule W02);
% DET: points O and Ma are not the same
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Using the circle k(O,C) and the line ma, construct a point Na and a point Nak (rule W04);
% NDG: line ma and circle k(O,C) intersect
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Using the point Na and the point Ta, construct a line sa (rule W02);
% DET: points Na and Ta are not the same
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Using the circle k(O,C), the line sa, the point O and the point Na, construct a point A (rule W05);
% NDG: line sa and circle k(O,C) intersect
% DET: points Na and A must be different