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import java.io.*;
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public class BufferedInOutputStream {
public BufferedInOutputStream() {
ioTest2();
}
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public class Coordinate {
 public int headX, headY;
 Coordinate(int headX, int headY) {
  this.headX = headX;
  this.headY = headY;
 }
  
 public boolean equals(Coordinate c) {
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