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\newcounter{mylecture}
\newenvironment{lecture}[2][\themylecture]%
{%
\refstepcounter{mylecture}
\vspace{0.15cm}
\def\lecnum{#1}
\def\lecdate{#2}
\begin{FlushRight}
\scriptsize
\textit{Лекция \textnumero\lecnum~от \lecdate}
\label{lec:no#1}
\hrule
\end{FlushRight}
}%
{%
% Updates the counter, so the next lecture's number agrees.
\setcounter{mylecture}{\lecnum}
\begin{FlushLeft}
\hrule
\scriptsize
\textit{\hyperref[lec:no\lecnum]{Вернуться} к началу Лекции \textnumero\lecnum.}
\end{FlushLeft}
}AS
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