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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 content(self, content):
 """ Sets the content of this SupportLevelPage. :param content: The content of this SupportLevelPage. :type: list[str] """

        allowed_values = ["UNRELEASED", "EARLYACCESS", "SUPPORTED", "EXTENDED_SUPPORT", "EOL"]
        if not set(content).issubset(set(allowed_values)):
            raise ValueError(
                "Invalid values for `content` [{0}], must be a subset of [{1}]"
                .format(", ".join(map(str, set(content)-set(allowed_values))),
                        ", ".join(map(str, allowed_values)))
            )

        self._content = content