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CALVERT SOCIAL INVESTMENT FUND MANAGED GROWTH PORTFOLIO Prospectus dated January 31, 1998, revised March 31, 1998 Date of Supplement: October 1, 1998 Effective December 1, 1998, Calvert Social Investment Fund Managed Growth Portfolio will be renamed Calvert Social Investment Fund Balanced Portfolio. All references in the prospectus to the Calvert Social Investment Fund Managed Growth Portfolio should be changed to reflect the new name.
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