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import java.io.*;
public class Define {
  double [][]y=new double [20][3];
  public synchronized void Calculating(){
  double lamsq=0.25, dt=0.003, m=0.037, a=(7-(2/lamsq)), b=(6-(2/lamsq)), c=(5-(2/lamsq)), d=(2-(2/lamsq)), F=((dt*dt)*0.1)/m;
  int i,Force;
  for(int n=0;n<2000;n++){
  if(n<4)
  Force=8;
  else
  Force=0;
  y[0][2]=-y[0][0]-lamsq*(a*y[0][1]-4*y[1][1]+y[2][1]);
  y[1][2]=-y[1][0]-lamsq*(-4*y[0][1]+b*y[1][1]-4*y[2][1]+y[3][1]);
  for(i=2;i<18;i++)
  y[i][2]=-y[i][0]-lamsq*(y[i-2][1]-4*y[i-1][1]+b*y[i][1]-4*y[i+1][1]+y[i+2][1]);
  y[18][2]=-y[18][0]-lamsq*(y[16][1]-4*y[17][1]+c*y[18][1]-2*y[19][1]);
  y[19][2]=-y[19][0]-lamsq*(2*y[17][1]-4*y[18][1]+d*y[19][1])+Force;
  for(i=0;i<20;i++){
  y[i][0]=y[i][1];
  y[i][1]=y[i][2];
  }
  }
  }
  public synchronized void Printing() throws Exception{
  BufferedWriter bw = new BufferedWriter(new FileWriter("M:/RTS.txt"));
  for(int i=0;i<20;i++){
  Str


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