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<div ng-app="myApp">
    <div>
        <a href="" ng-click="toggle = !toggle">Toggle nav</a>
        <ul ng-show="toggle">
            <li>Link 1</li>
            <li>Link 2</li>
            <li>Link 3</li>
        </ul>
    </div>
</div>

var myApp = angular.module('myApp', []);