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Almost a third of stock mutual funds run by Fidelity Investments returned more than 10% last month, when the S&P 500 Index climbed 8.5%.

Among those 63 mutual funds, three that invest in chemical and technology companies might be worth buying before the economy rebounds. The funds -- Fidelity's Select Chemicals Portfolio, Select Materials Portfolio and Advisor Technology Fund -- each returned about 14% last month.

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Chemical stocks are likely to gain as the recession lifts because manufacturers need them for their products. Technology shares will rise when companies start upgrading their computer systems and consumers can afford to buy electronic devices again.

The Fidelity Select Chemicals Portfolio's ( FSCHX) top two holdings are Monsanto ( MON) and Praxair ( PX). The stocks have returned 12% and 13% this year, respectively, doubling the 5.4 rise of the S&P 500 Chemicals Index.

Chemical companies make up more than half of the Fidelity Select Materials Portfolio ( FSDPX). The fund holds some of the same stocks as the chemicals fund, but offers exposure to metals through Newmont Mining ( NEM) and Freeport-McMoRan ( FCX). Freeport-McMoRan jumped 25% in March on optimism about copper demand.

The Fidelity Advisor Technology Fund ( FATEX) invests heavily in Hewlett-Packard ( HPQ) and Cisco Systems ( CSCO), companies that have been named as potential suitors for Sun Microsystems ( JAVA) now that talks with IBM ( IBM) have broken down. The U.S. General Services Administration has named Hewlett-Packard the centralized buyer for information technology products and services, giving it the inside track to bid on $50 billion in projects.

These funds ranked among the top third of "hold"-rated funds at the end of February. They could be upgraded to "buy" in light of their March performances.

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