array(3) {
  [1]=>
  array(2) {
    [0]=>
    int(4813)
    [1]=>
    int(6009)
  }
  [9]=>
  array(2) {
    [0]=>
    int(6058)
    [1]=>
    int(7007)
  }
  [21]=>
  array(1) {
    [0]=>
    int(9636)
  }
}