| http://www.w3.org/ns/prov#value | - roup uniquely corresponds to one of a plurality of preestablished keyword classes numbered from 1 to a number c from most common to least common in the database; identifying, for each of the c-1 most common groups d1 to dc-1, a document keyword ki that has greatest summed mutual information ##EQU20## wherein i is the number of the each group, Ki is a random variable corresponding to appearance or
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