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<?xml version="1.0"?> <!DOCTYPE mrow SYSTEM "mathml.dtd"> <mrow> <mi>f</mi> <mfenced> <mrow> <mi>x</mi> <mo>+</mo> <mi>y</mi> </mrow> </mfenced> </mrow>
<?xml version="1.0"?>
<!DOCTYPE mrow SYSTEM "mathml.dtd">
<mrow>
<mi>f</mi>
<mfenced>
<mi>x</mi>
<mo>+</mo>
<mi>y</mi>
</mrow>
</mfenced>