This Portfolio primarily focuses on municipal bonds, committing a minimum of 80% of its net assets, under typical market conditions, to those generating interest income free from federal taxation. The fund’s dollar-weighted average duration is generally managed relative to its benchmark, the S&P Intermediate Term National AMT-Free Municipal Bond Index. Specifically, its duration will typically remain within a range of no more than half a year longer, and no less than one year shorter, than the benchmark’s average duration.