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Using the point O and the point Mc, construct a line mc (rule W02);
% DET: points O and Mc are not the same
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Using the point Ha and the point Mc, construct a circle k(Mc,A) (rule W06);
% NDG: points Ha and Mc are not the same
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Using the point Mc and the line mc, construct a line c (rule W10a);
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Using the circle k(Mc,A) and the line c, construct a point A and a point B (rule W04);
% NDG: line c and circle k(Mc,A) intersect
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Using the point Ha and the point B, construct a line a (rule W02);
% DET: points Ha and B are not the same
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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), 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