import com.google.common.collect.ImmutableRangeSet;
import com.google.common.collect.RangeSet;
import com.google.common.primitives.UnsignedLong;
import com.google.common.collect.ImmutableRangeSet;
import com.google.common.collect.RangeSet;
import com.google.common.primitives.UnsignedLong;
private static final long serialVersionUID = 1L;
private final RangeSet<UnsignedLong> purgedIdentifiers;
private static final long serialVersionUID = 1L;
private final RangeSet<UnsignedLong> purgedIdentifiers;