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Snapshots of the R-U frontiers discovered via a single run of the Sublattice Heuristic Search (SHS) algorithm. The initialized frontier for the (a) Adult-TN and (c) North Carolina Voter Registration (NCVR) datasets are based on 1000 policies. The improved frontier for (b) Adult-TN and (d) NCVR datasets are based on an additional 4000 policies.
