deletions | additions       diff --git a/on_constraint_graph_begin_quote__.tex b/on_constraint_graph_begin_quote__.tex  index 344c117..3d8d9f0 100644  --- a/on_constraint_graph_begin_quote__.tex  +++ b/on_constraint_graph_begin_quote__.tex 
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on 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.