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With inspiration from other libraries

There is a newer version: 5.17.0

package io.nosqlbench.virtdata.library.realer;

import io.nosqlbench.virtdata.api.annotations.Categories;
import io.nosqlbench.virtdata.api.annotations.Category;
import io.nosqlbench.virtdata.api.annotations.Example;
import io.nosqlbench.virtdata.api.annotations.ThreadSafeMapper;
import io.nosqlbench.virtdata.library.basics.shared.distributions.CSVSampler;

/**
 * Return a county name weighted by population density.
 */
@ThreadSafeMapper
@Categories(Category.premade)
public class CountiesByDensity extends CSVSampler {
    @Example("CountiesByDensity()")
    public CountiesByDensity() {
        super("county_name","density","data/simplemaps/uszips.csv");
    }
}