data/mathematica/2.mml
Syntax::sntxf: "(" cannot be followed by "X, Σ)".
ToExpression::esntx: Could not parse (X,\Sigma) as input.
<math
xmlns='http://www.w3.org/1998/Math/MathML'>
<semantics>
<mi>$Failed</mi>
<annotation-xml encoding='MathML-Content'>
<ci>$Failed</ci>
</annotation-xml>
</semantics>
</math>