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topgpds.html
topgpds.html
http://arquivo.pt/wayback/20160514115224/http:/www.bangor.ac.uk/r.brown/topgpds.html
Equivalence relation
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topgpds.html
http://arquivo.pt/wayback/20160514115224/http:/www.bangor.ac.uk/r.brown/topgpds.html