array(3) {
  [1]=>
  array(1) {
    [0]=>
    int(5688)
  }
  [9]=>
  array(2) {
    [0]=>
    int(5711)
    [1]=>
    int(5727)
  }
  [21]=>
  array(3) {
    [0]=>
    int(9610)
    [1]=>
    int(9621)
    [2]=>
    int(9638)
  }
}