Fannie Mae has completed its second subprime securitization in almost as many months. But officials continue to maintain that they are not entering the market in any systematic way. "We will do deals and if people approach us, we will listen," said Alfred King, a Fannie spokesman. He added, however, that the company’s decision to guarantee $633.34 million of Long Beach Mortgage’s 2001-3 subprime mortgage deal doesn’t mean that the secondary market giant will necessarily