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\ProvidesPackage{natbib}
\input{natbib-common.hva}
\renewcommand{\@NAT@os}{{\@nostyle\@print{<sup>}}}
\renewcommand{\@NAT@cs}{{\@nostyle\@print{</sup>}}}
\renewcommand{\@biblabel}[1]
{\@locname{#1}{\NAT@bibread{#1}\purple\NAT@format@item{#1}{\NAT@num}{\NAT@auth}{\NAT@year}}}
\newcommand{\NAT@fmt}[3]
  {\def\@tmp{#2}\ifx\@tmp\@empty{}???\else\NAT@format@cite{#2}{#3}{#1}\fi}
\renewcommand{\@bibref}[3]
{\ifciteindex\@locnameref{\NAT@index{#1}}{#1}{\NAT@fmt{#1}{#2}{#3}}%
\else\@locref{#1}{\NAT@fmt{#1}{#2}{#3}}\fi}