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<<< mml
<?xml version="1.0" encoding="UTF-8"?>
<math xmlns="http://www.w3.org/1998/Math/MathML">
<mstyle displaystyle="true">
<munderover>
<mo>∑</mo>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mn>0</mn>
</mrow>
<mi>∞</mi>
</munderover>
<msub>
<mi>x</mi>
<mi>i</mi>
</msub>
</mstyle> </math>
>>> native
[ EUnderover
False
(ESymbol Op "\8721")
(EGrouped [ EIdentifier "i" , ESymbol Rel "=" , ENumber "0" ])
(EIdentifier "\8734")
, ESub (EIdentifier "x") (EIdentifier "i")
]
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