\r
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\renewcommand{\vec}{\overrightarrow}\r
-\newcommand{\reflemma}[1]{Lemma~\ref{l:#1}}
\ No newline at end of file
+\newcommand{\reflemma}[1]{Lemma~\ref{l:#1}}\r
+\newcommand{\head}{h}\r
+\newcommand{\args}{a}\r