<script>
var model = avalon.define({
$id: "myduplex",
arr: [{"name":"a"}, {"name":"b"}, {"name":"c"}, {"name":"d"}]
})
</script>
<p ms-for="(index,el) in @arr">{{el.name}}
<div ms-if="el==null">
"a"
</div>
you can"t print four "a"
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...
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