The union-find datastore needs to be reinitialized for each dedup iteration #5
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The union-find stores the disjoin set representation of document idx (numbering started from 0) and the semantics are different in each iteration (i.e. group1, and group2 here). For example, the same number would refer to the different documents in group 1 and group 2, without reinitializing and clearing the union-find store, it'll contaminate the result for the next group.