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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def xml_decode(string):
 """ Returns the string with special characters decoded. """

    string = string.replace("&amp;", "&")
    string = string.replace("&lt;",  "<")
    string = string.replace("&gt;",  ">")
    string = string.replace("&quot;","\"")
    string = string.replace("/", SLASH)
    return string