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Using the point C and the point Tb, construct a line b (rule W02);
% DET: points C and Tb are not the same
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Using the point Tb and the point I, construct a line sb (rule W02);
% DET: points Tb and I are not the same
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Using the point I and the line b, construct a circle k(I,Pa) (rule W11);
% NDG: point I is not incident to the line b
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Using the circle k(I,Pa), the point C, the point I and the line b, construct a line a (rule W13);
% NDG: point C is outside the circle k(I,Pa)
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Using the line a and the line sb, construct a point B (rule W03);
% NDG: lines a and sb are not parallel
% DET: lines a and sb are not the same
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Using the circle k(I,Pa), the point B, the point I and the line a, construct a line c (rule W13);
% NDG: point B is outside the circle k(I,Pa)
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Using the line c and the line b, construct a point A (rule W03);
% NDG: lines c and b are not parallel
% DET: lines c and b are not the same