From

https://en.wikipedia.org/w/index.php?diff=456329927:

Typing <math></math> gives: UNIQ6e8c92a14d4a1f19-math-00000026-QINU.

Granted an empty <math></math> pair is pointless, but one had somehow got into the wikitext of 'Central limit theorem' — see [[Talk:Central limit theorem#Rubbish in Multivariate]]

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