<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE PROOF SYSTEM "http://a3pat.ensiie.fr/pub/a3pat.dtd">
<PROOF><SIGNATURE><SYMBOLLIST><SYMBOL arity="2" unmarked="f"><NAME>Marked_f</NAME></SYMBOL><SYMBOL arity="2" unmarked=""><NAME>f</NAME></SYMBOL><SYMBOL arity="2" unmarked="h"><NAME>Marked_h</NAME></SYMBOL><SYMBOL arity="2" unmarked=""><NAME>h</NAME></SYMBOL></SYMBOLLIST><VARLIST><VAR>y</VAR><VAR>x</VAR></VARLIST></SIGNATURE><PROPERTY criterion="dp" prop="sntrs"><SYSTEM><REWSYS><RULE><LHS>f(x,y)</LHS><RHS>h(x,y)</RHS></RULE><RULE><LHS>f(x,y)</LHS><RHS>h(y,x)</RHS></RULE><RULE><LHS>h(x,x)</LHS><RHS>x</RHS></RULE></REWSYS></SYSTEM><CRITERION/><PROPERTY criterion="weakgraph" prop="sndp"><SYSTEM><DPSYS><REWSYS><RULE><LHS>f(x,y)</LHS><RHS>h(x,y)</RHS></RULE><RULE><LHS>f(x,y)</LHS><RHS>h(y,x)</RHS></RULE><RULE><LHS>h(x,x)</LHS><RHS>x</RHS></RULE></REWSYS><DPLIST><DPRULE num="0"><LHS>Marked_f(x,y)</LHS><RHS>Marked_h(x,y)</RHS></DPRULE><DPRULE num="1"><LHS>Marked_f(x,y)</LHS><RHS>Marked_h(y,x)</RHS></DPRULE></DPLIST></DPSYS></SYSTEM><CRITERION><DAG approx="simpl"><CCLIST><NONSCC num="0"><NODE ref="1"/></NONSCC><NONSCC num="1"><NODE ref="0"/></NONSCC></CCLIST></DAG></CRITERION></PROPERTY></PROPERTY></PROOF>
