document.write('
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  1. for(int i=0; i<btn.length; i++){
  2. for(int j=0; j<btn.length;j++){
  3. btn[i][j] = new Button(""+i+","+""+j);
  4. btn[i][j].setPrefSize(50, 50);
  5. gridPane.add(btn[i][j], i, j);
  6. }
  7. }
');