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In ARES, relational operations have been functionally augmented with an additional comparison operator. This operator implies `approximately equal to' or `similar to' for cases in which the user expects the system to perform a flexible interpretation of the query conditions. The functional augmentation is simply achieved by a combination of conventional relational operations. ARES is now in actual operation in a research environment, and will contribute to the next step of research toward implementation of highly intelligent data processing facilities beyond the present scope of database technology.