why ng-repeat stop working at level 3

I am using angularjs to render a hierarchical structure. The test case is at http://jsbin.com/agodoj/1/edit

My question is why ng-repeat stop working at level 3 ? Thanks

Here is my model

function Test($scope) {
  $scope.cars = {
    chrylser: {
      nameplates: [{
        name: "np1",
        trims: [
          "tirm1", "trim2"
          ]
      }]
    }
  };
}

Here is my template

<div ng-app ng-controller="Test">
    <div ng-repeat="(key, value) in cars">
        {{key}}
        <ul>
            <li ng-repeat="np in value.nameplates">{{np.name}}, {{np.trims}}</li>
            <ul>
                <li ng-repeat="trim in np.trims">
                   (ng-repeat stop working here) {{trim}}
                </li>
            </ul>
        </ul>
    </div>
</div>