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Using the point Hb and the point Tb, construct a line b (rule W02);
% DET: points Hb and Tb are not the same
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Choose freely a point A on the line b (rule WOnline1)
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Using the point Hb and the line b, construct a line hb (rule W10b);
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Choose freely a point B on the line hb (rule WOnline2)
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Using the point B and the point A, construct a line c (rule W02);
% DET: points B and A are not the same
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Using the point Tb and the line c, construct a circle k(Tb,foot[Tb,c]) (rule W11);
% NDG: point Tb is not incident to the line c
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Using the circle k(Tb,foot[Tb,c]), the point B, the point Tb and the line c, construct a line a (rule W13);
% NDG: point B is outside the circle k(Tb,foot[Tb,c])
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Using the line a and the line b, construct a point C (rule W03);
% NDG: lines a and b are not parallel
% DET: lines a and b are not the same