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Using the point Ha and the point H, construct a line ha (rule W02);
% DET: points Ha and H are not the same
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Using the point Ha and the line ha, construct a line a (rule W10a);
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Choose freely a point Ma on the line a (rule WOnline2)
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Choose freely a point A on the line ha (rule WOnline1)
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Using the point A and the point Ma, construct a point G (rule W01);
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Using the point H and the point G, construct a point O (rule W01);
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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) and the line a, construct a point C and a point B (rule W04);
% NDG: line a and circle k(O,C) intersect