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\item \self In the following list tick all statements that are \texttt{true}.
\begin{itemize} \item[$\square$] An edge between two non-adjacent nodes $n_1$ and $n_2$ within a graph $G$ is called a chord. \item[$\square$] A graph is called chordal, if it contains no chord-free cycles with size greater than 2. \item[$\square$] A cycle is said to be chord-free, if in the cycle there exist no non-adjacent nodes that are connected by an edge. \item[$\square$] An edge between two non-adjacent nodes $n_1$ and $n_2$ within a graph $G$ is called a cycle. \end{itemize}
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