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<html>
<body>
<div tal:define="x string:X;nil string:">
<p tal:content="x">1</p>
<p tal:content="x | nil">2</p>
<p tal:content="python:nil or x">3</p>
<p tal:content="y/z | x">4</p>
<p tal:content="y/z | x | nil">5</p>
<p tal:attributes="name nil">Z</p>
<p tal:attributes="name y/z | nil">Z</p>
<p tal:attributes="name y/z | nothing">Z</p>
<p tal:on-error="python:str(error.value[0])" tal:content="a/b | c/d">Z</p>
</div>
</body>
</html>
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