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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 cgi_method_is_post(environ: Dict[str, str]) -> bool: """ Determines if the CGI method was ``POST``, given the CGI environment. """

    method = environ.get("REQUEST_METHOD", None)
    if not method:
        return False
    return method.upper() == "POST"