W3C MathML TestSuite: Version 3: Test-case nestedAwidth1

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\begin{matrix} \begin{matrix} 1 & 2 \\ x & y \end{matrix} \\ \begin{matrix} 1 & 2 \\ x & y \end{matrix} \\ \begin{matrix} 1 & 2 \\ x & y \end{matrix} \end{matrix}