var menuOptions = [
        ["Page One"],
        ["Page Two"],
        ["Page Three"],
        ["Page Four", ["Sub-Page 1", "Sub-Page 2", "Sub-Page 3"] ],
        ["Page Five"]
    ];

<ul>
        <li>Page One</li>
        <li>Page Two</li>
        <li>Page Three</li>
        <li>Page Four
            <ul>
                <li>Sub-Page 1</li>
                <li>Sub-Page 2</li>
                <li>Sub-Page 3</li>
            </ul>
        </li>
        <li>Page Five</li>
   </ul>

var menuOptions = [
    ["Page One", []],
    ["Page Two", []],
    ["Page Three", []],
    ["Page Four", ["Sub-Page 1", "Sub-Page 2", "Sub-Page 3"] ],
    ["Page Five", []]
];

<ul>
  <li ng-repeat='option in menuOptions'>
    {{option[Ø]}}
    <ul>
      <li ng-repeat='suboption in option[1]'>{{suboption}}</li>
    </ul>
  <li>
</ul>