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void non-overlap-rect(){
  int[] Box;
  Box[0] = new int[]{int(random(100)), int(random(100)), int(random(100)), int(random(100))};
  for( int i = 2 ; i < 5 ; i++ )
    if( overlap(Box[j-1], Box[j]) == true ) non-overlap-rect();
  
  boolean overlap(int[] BoxA, int[] BoxB){
    return !(BoxA[0] > BoxB[0] || BoxA[1] > BoxB[1] || BoxA[2] > BoxB[2] || BoxA[3] > BoxB[3]);
  }
}