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The article currently says "For example, if the casting includes reentrant angles or complex angular surfaces then the rubber is flexible enough to be removed, unlike metal.". This needs more explanation, I think. The link to reentrant doesn't really explain the sentence. NiceGuyEduardo

I've change the link to link the the definition at Wikitionary. Wizard191 ( talk) 15:48, 30 June 2009 (UTC) reply