Example exc-129

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Next: exc-130

xyz xy xz zy

<math>
<apply><divergence/>
    <bvar><ci>x</ci></bvar><bvar><ci>y</ci></bvar><bvar><ci>z</ci></bvar>
    <vector>
        <apply><plus/><ci>x</ci><ci>y</ci></apply>
        <apply><plus/><ci>x</ci><ci>z</ci></apply>
        <apply><plus/><ci>z</ci><ci>y</ci></apply>
    </vector>
</apply>
</math>