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0x222B normal  integral $\int   $ or $\normalint  $
0x222C double  integral $\iint  $ or $\normaliint $
0x222D triple  integral $\iiint $ or $\normaliiint$
0x222E contour integral $\oint  $
0x222F surface integral $\oiint $
0x2230 volume  integral $\oiiint$
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