array(1) {
  [0]=>
  object(stdClass)#1 (1) {
    ["a"]=>
    object(stdClass)#2 (0) {
    }
  }
}
array(1) {
  [0]=>
  object(stdClass)#1 (2) {
    ["a"]=>
    object(stdClass)#2 (0) {
    }
    ["b"]=>
    object(stdClass)#3 (0) {
    }
  }
}
array(1) {
  [0]=>
  object(stdClass)#1 (3) {
    ["a"]=>
    object(stdClass)#2 (0) {
    }
    ["b"]=>
    object(stdClass)#3 (0) {
    }
    ["c"]=>
    object(stdClass)#2 (0) {
    }
  }
}