deletions | additions       diff --git a/begin_quote_The_nodes_of__.tex b/begin_quote_The_nodes_of__.tex  index ce0ebe4..344c117 100644  --- a/begin_quote_The_nodes_of__.tex  +++ b/begin_quote_The_nodes_of__.tex 
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on constraint graph:  \begin{quote}  The nodes of the graph correspond to variables of the problem, and a link connects any two variables that participate in a constraint.  \end{quote}