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"An unnamed parameter cannot contain an ordinary equals sign, as this would be interpreted as setting off a named parameter. (This does not apply if the equals sign comes within another template call or other item which the parser handles separately.) To pass an equals sign in an unnamed parameter (for example in a URL with key/value pairs), replace the equals sign with the special template =, which returns an equals sign that will not be specially interpreted." http://en.wikipedia.org/wiki/Help:Template#Usage_hints_and_workarounds