array(3) {
  [0] => array(2) {
    [0] => string(1) "1"
    [1] => string(1) "2"
  }
  [1] => array(2) {
    [0] => string(1) "1"
    [1] => string(1) "2"
  }
  [2] => array(1) {
    [0] => string(1) "1"
  }
}