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Test Info:

<?xml version="1.0"?>
<!DOCTYPE html PUBLIC
"-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN"
"http://www.w3.org/TR/MathML2/dtd/xhtml-math11-f.dtd"
[
<!ENTITY mathml "http://www.w3.org/1998/Math/MathML">
]>
<math display="block" xmlns="&mathml;">
<mi>f &#x0332;</mi>
<mi>-</mi>
<mo>+</mo>
<mo> -</mo>
<mo>&#x0332;</mo>
</math>