\usepackage {pstricks} \begin{pspicture}(-.2,-.5)(3,1)\showgrid \rput(.5,.5){\rnode{A}{\psframebox{Cat}}} \rput(2.5,.5){\rnode{B}{\psframebox{Dog}}} \ncarc{->}{A}{B} \ncarc{->}{B}{A} \end{pspicture}
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