The problem using "words" when excluding is that you run the risk of filtering perfectly good anonymous proxies that aren't Planetlab/CoDeeN. Therefore, as I have pointed out to you on numerous occasions, "words" should only be used when there are other alternatives.
In this case, because I stay on top of Planetlab/CoDeeN proxies and maintain and provide a list of their actual IP Addresses, the "words" necessary are few and I've included those truly necessary already.
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