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<mx:Script>
    import flash.external.*;
    public function myFunc():Number {
        return 42;
    }
    public function initApp():void {
        ExternalInterface.addCallback("myFlexFunction",myFunc);
    }
</mx:Script>
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<SCRIPT language='JavaScript' charset='utf-8'>
    function callApp() {
        var x = MyFlexApp.myFlexFunction();
        alert(x);
    }
</SCRIPT>
<button onclick="callApp()">Call App</button>
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