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% start out with plain.tex,
% having TFM-based CM fonts preloaded in \fam 0...3
% load OT math font in \fam 4
\input luaotfload.sty
\font\4={name:XITS Math:mode=base;script=math} at 10pt
\font\5={name:XITS Math:mode=base;script=math;ssty=1} at 7pt
\font\6={name:XITS Math:mode=node;script=math;ssty=2} at 5pt
\textfont4=\4 \scriptfont4=\5 \scriptscriptfont4=\6
%\tracingall
$$\Uradical "4 "221A {x}$$
$$\Uroot "4 "221A {3}{x^3+y^3}$$
$$
\Udelimiterover "4 "23DE {a+b}
+ \Udelimiterunder "4 "23DF {a+b} = C
$$
$$
\Umathaccent "0 "4 "23DE {a+b}
+ \Umathbotaccent "0 "4 "23DF {a+b} = C
$$
$$
A \mathrel{\Uoverdelimiter "4 "2192 {a+b}}
B \mathrel{\Uunderdelimiter "4 "2192 {a+b}}
$$
$$
a \overwithdelims() b
$$
\centerline{$ a \overwithdelims() b $}
\bye
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