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 import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Random;
public class ShuffleTest {
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package cf.java.study.java.io;
import java.io.File;
import java.io.FileInputStream;
import org.apache.commons.io.FileUtils;
import org.apache.commons.lang.StringUtils;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
public class FileTests {
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