/* package whatever; // don't place package name! */
import java.util.*;
import java.lang.*;
import java.io.*;
/* Name of the class has to be "Main" only if the class is public. */
public class Main {
private static String category
= "electronic trading system"; public static void main
(String[] args
) { Main system = null;
System.
out.
println(system.
category); }
}
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