array(3) {
  [0]=>
  array(2) {
    [0]=>
    string(5) "Volvo"
    [1]=>
    string(3) "BMW"
  }
  [1]=>
  array(2) {
    [0]=>
    string(6) "Toyota"
    [1]=>
    string(5) "Honda"
  }
  [2]=>
  array(2) {
    [0]=>
    string(8) "Mercedes"
    [1]=>
    string(4) "Opel"
  }
}