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| | \newcommand{\disp}[1]{{\displaystyle {#1}}}
\newcommand{\spc}[2]{{\ooalign{{\hss{$#1$}\hss}\crcr{\phantom{\hss{$#2$}\hss}}}}}
\newcommand{\clap}[2]{{\ooalign{{\hss{$#1$}\hss}\crcr{\hss{$#2$}\hss}}}}
\renewcommand{\b}[1]{{\bm {#1}}}
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\newcommand{\grad }{\mathrm{grad}}
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\rm #1}}
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\leaders\vrule\@height.7\p@\hfill
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\def\downbracketfill{$\m@th
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\leaders\vrule\@height.7\p@\hfill
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|