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plot2d([-100,500],[-100,600],[-1,-1],"022");
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plot2d([-100,500],[-100,600],[-1,-1],strf="022");
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xsegs(10*x1+200*ones(x1),10*y1+200*ones(y1));
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// rectangle clipping zone
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clf(); plot2d([-100,500],[-100,600],[-1,-1],"022")
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clf(); plot2d([-100,500],[-100,600],[-1,-1],strf="022")
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xrect(clipBox(1), clipBox(2), clipBox(3), clipBox(4));