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<!DOCTYPE PROOF SYSTEM "http://a3pat.ensiie.fr/pub/a3pat.dtd">
<PROOF><SIGNATURE><SYMBOLLIST><SYMBOL arity="1" unmarked="minus"><NAME>Marked_minus</NAME></SYMBOL><SYMBOL arity="1" unmarked=""><NAME>h</NAME></SYMBOL><SYMBOL arity="2" unmarked=""><NAME>f</NAME></SYMBOL><SYMBOL arity="1" unmarked=""><NAME>minus</NAME></SYMBOL></SYMBOLLIST><VARLIST><VAR>y</VAR><VAR>x</VAR></VARLIST></SIGNATURE><PROPERTY criterion="dp" prop="sntrs"><SYSTEM><REWSYS><RULE><LHS>minus(minus(x))</LHS><RHS>x</RHS></RULE><RULE><LHS>minus(h(x))</LHS><RHS>h(minus(x))</RHS></RULE><RULE><LHS>minus(f(x,y))</LHS><RHS>f(minus(y),minus(x))</RHS></RULE></REWSYS></SYSTEM><CRITERION/><PROPERTY criterion="weakgraph" prop="sndp"><SYSTEM><DPSYS><REWSYS><RULE><LHS>minus(minus(x))</LHS><RHS>x</RHS></RULE><RULE><LHS>minus(h(x))</LHS><RHS>h(minus(x))</RHS></RULE><RULE><LHS>minus(f(x,y))</LHS><RHS>f(minus(y),minus(x))</RHS></RULE></REWSYS><DPLIST><DPRULE num="0"><LHS>Marked_minus(h(x))</LHS><RHS>Marked_minus(x)</RHS></DPRULE><DPRULE num="1"><LHS>Marked_minus(f(x,y))</LHS><RHS>Marked_minus(y)</RHS></DPRULE><DPRULE num="2"><LHS>Marked_minus(f(x,y))</LHS><RHS>Marked_minus(x)</RHS></DPRULE></DPLIST></DPSYS></SYSTEM><CRITERION><DAG approx="simpl"><CCLIST><SCC num="0"><NODE ref="0"/><NODE ref="1"/><NODE ref="2"/></SCC></CCLIST></DAG></CRITERION><PROPERTY criterion="sterm" prop="sndp"><SYSTEM><DPSYS><REWSYS><RULE><LHS>minus(minus(x))</LHS><RHS>x</RHS></RULE><RULE><LHS>minus(h(x))</LHS><RHS>h(minus(x))</RHS></RULE><RULE><LHS>minus(f(x,y))</LHS><RHS>f(minus(y),minus(x))</RHS></RULE></REWSYS><DPLIST><DPRULE num="0"><LHS>Marked_minus(h(x))</LHS><RHS>Marked_minus(x)</RHS></DPRULE><DPRULE num="1"><LHS>Marked_minus(f(x,y))</LHS><RHS>Marked_minus(y)</RHS></DPRULE><DPRULE num="2"><LHS>Marked_minus(f(x,y))</LHS><RHS>Marked_minus(x)</RHS></DPRULE></DPLIST></DPSYS></SYSTEM><PROJECTION><PROJ><SYMBOL><NAME>Marked_minus</NAME></SYMBOL><INT>1</INT></PROJ></PROJECTION><STRICTPAIRS><DPLIST><DPRULE num="0"><LHS>Marked_minus(f(x,y))</LHS><RHS>Marked_minus(x)</RHS></DPRULE><DPRULE num="1"><LHS>Marked_minus(f(x,y))</LHS><RHS>Marked_minus(y)</RHS></DPRULE><DPRULE num="2"><LHS>Marked_minus(h(x))</LHS><RHS>Marked_minus(x)</RHS></DPRULE></DPLIST></STRICTPAIRS><PROPERTY criterion="weakgraph" prop="sndp"><SYSTEM><DPSYS><REWSYS><RULE><LHS>minus(minus(x))</LHS><RHS>x</RHS></RULE><RULE><LHS>minus(h(x))</LHS><RHS>h(minus(x))</RHS></RULE><RULE><LHS>minus(f(x,y))</LHS><RHS>f(minus(y),minus(x))</RHS></RULE></REWSYS><DPLIST/></DPSYS></SYSTEM><CRITERION><DAG approx="simpl"><CCLIST/></DAG></CRITERION></PROPERTY></PROPERTY></PROPERTY></PROPERTY></PROOF>
