array(3) {
  [1]=>
  array(2) {
    [0]=>
    int(2992)
    [1]=>
    int(4610)
  }
  [9]=>
  array(4) {
    [0]=>
    int(2993)
    [1]=>
    int(3211)
    [2]=>
    int(3312)
    [3]=>
    int(4611)
  }
  [21]=>
  array(1) {
    [0]=>
    int(9620)
  }
}