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I just want to make a note of something I read here: http://en.wikibooks.org/wiki/Ruby_Programming/Syntax/Classes#Protected def <=>(other) self.age <=> other.age end It says: "If age is private, this method will not work, because other.age is not accessible. If "age" is protected, this will work fine, because self and other are of same class, and can acces...

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