import java.util.*;
import java.util.regex.*;
import java.io.*;

public class DataMunging2 {

    public static final Pattern e = Pattern.compile("\\s+");

    public static void main(String[] args) {
        try {
            BufferedReader infile = new BufferedReader(new FileReader(args[0]));
            List<String> duplicates = new ArrayList<String>();
            Set<String> datestamps = new HashSet<String>();