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\input{umtest-preamble} \usepackage{unicode-math} \setmathfont{Asana Math} \begin{document} [$x_{x}'$] [$x_{x}′$] [$x_{x}\prime$] [$x_{x}`$] [$x_{x}\backprime$] [$x'_x$] [$x′_x$] [$x\prime_x$] [$x`_x$] [$x\backprime_x$] [$x_{x'}$] [$x_{x′}$] [$x_{x\prime}$] [$x_{x`}$] [$x_{x\backprime}$] \end{document}