\usepackage {pstricks} \begin{pspicture}(-.2,-.5)(3,2)\showgrid \rput(.5,.5){\rnode{A}{\psframebox{Cat}}} \rput(2.5,1.5){\rnode{B}{\psframebox{Dog}}} \ncloop[loopsize=.25,angleB=180]{A}{B} \end{pspicture}
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