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\begin{centering}\setlength{\unitlength}{.55cm}\begin{picture}(1,1)\put(1,-11){\vector(0,1){10}}\put(0,-10){\vector(1,0){10}}\put(1.15,-0.65){$y$}\put(9.95,-10.55){$x$}\linethickness{.25mm}\put(0,-1){\line(1,-1){10}}\qbezier(0,-9.75)(3.35,-11.5)(7,-1)\end{picture}\end{centering}