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